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  <xsd:element name="DisclosureOfDetailedInformationAboutTradePayablesAndAccruedLiabilitiesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutTradePayablesAndAccruedLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfNonVestedSharesAbstract" id="aciu_NumberOfNonVestedSharesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOtherEquityInstrumentsExercisedInShareBasedPaymentArrangement" id="aciu_NumberOfOtherEquityInstrumentsExercisedInShareBasedPaymentArrangement" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedPaymentArrangementAbstract" id="aciu_ShareBasedPaymentArrangementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumTermOfOtherEquityInstrumentsGrantedForShareBasedPaymentArrangement" id="aciu_MaximumTermOfOtherEquityInstrumentsGrantedForShareBasedPaymentArrangement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockUnitsMember" id="aciu_RestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BoardOfDirectorsMember" id="aciu_BoardOfDirectorsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VestingRequirementsForShareBasedPaymentArrangementAwardVestingPeriod" id="aciu_VestingRequirementsForShareBasedPaymentArrangementAwardVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExecutiveManagementMember" id="aciu_ExecutiveManagementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageExercisePriceAbstract" id="aciu_WeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedSharesAndRestrictedShareUnitsMember" id="aciu_RestrictedSharesAndRestrictedShareUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SensitivityAnalysisActuarialAssumptionsAbstract" id="aciu_SensitivityAnalysisActuarialAssumptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleDecreaseInActuarialAssumptionMember" id="aciu_PercentageOfReasonablyPossibleDecreaseInActuarialAssumptionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleIncreaseInActuarialAssumptionMember" id="aciu_PercentageOfReasonablyPossibleIncreaseInActuarialAssumptionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ChangesInFairValueOfPlanAssetsAbstract" id="aciu_ChangesInFairValueOfPlanAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOptionsAbstract" id="aciu_NumberOfOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageRemainingAbstract" id="aciu_WeightedAverageRemainingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialAssetsAndLiabilitiesAbstract" id="aciu_FinancialAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedExpensesMember" id="aciu_AccruedExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TradeAndOtherPayablesMember" id="aciu_TradeAndOtherPayablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialRisksAbstract" id="aciu_FinancialRisksAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfFinancialInstitutionsHoldingCashAndCashEquivalentsAndShortTermFinancialAssets" id="aciu_NumberOfFinancialInstitutionsHoldingCashAndCashEquivalentsAndShortTermFinancialAssets" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermFinancialAssetsMember" id="aciu_LongTermFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashOnHandAndCashEquivalentsMember" id="aciu_CashOnHandAndCashEquivalentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortTermFinancialAssetsMember" id="aciu_ShortTermFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortTermLeaseLiabilitiesMember" id="aciu_ShortTermLeaseLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RightOfUseFinancialAssetsMember" id="aciu_RightOfUseFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutCarryingAmountsOfFinancialAssetsAndFinancialLiabilitiesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutCarryingAmountsOfFinancialAssetsAndFinancialLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OutstandingOptionsExercisePriceRangeAndExpiryDatesAbstract" id="aciu_OutstandingOptionsExercisePriceRangeAndExpiryDatesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfEquityBasedInstrumentPlans" id="aciu_NumberOfEquityBasedInstrumentPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockOptionPlanC1Member" id="aciu_StockOptionPlanC1Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanMember" id="aciu_Two016ShareOptionAndIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheOneMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheTwoMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedPlansOutstandingAbstract" id="aciu_ShareBasedPlansOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement" id="aciu_MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeesMember" id="aciu_EmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheThreeMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxLossCarryforwardPeriod" id="aciu_IncomeTaxLossCarryforwardPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaidExpensesAndAccruedIncomeDisclosureAbstract" id="aciu_PrepaidExpensesAndAccruedIncomeDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAccountingPolicyForChangesInAccountingPoliciesRecentlyAdoptedTextBlock" id="aciu_DisclosureOfAccountingPolicyForChangesInAccountingPoliciesRecentlyAdoptedTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DescriptionOfAccountingPolicyForAccountingJudgmentsAndEstimatesPolicyTextBlock" id="aciu_DescriptionOfAccountingPolicyForAccountingJudgmentsAndEstimatesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrantIncomePolicyTextBlock" id="aciu_GrantIncomePolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DescriptionOfAccountingPolicyForClassificationOfAssetsAndLiabilitiesPolicyTextBlock" id="aciu_DescriptionOfAccountingPolicyForClassificationOfAssetsAndLiabilitiesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentsTable" id="aciu_CashAndCashEquivalentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentLineItems" id="aciu_CashAndCashEquivalentLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InProcessResearchAndDevelopmentIPRDAssetMember" id="aciu_InProcessResearchAndDevelopmentIPRDAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseInNumberOfOrdinarySharesIssuedUnderIncentivePlans" id="aciu_IncreaseInNumberOfOrdinarySharesIssuedUnderIncentivePlans" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseThroughTreasuryShareTransactionsEquityShares" id="aciu_IncreaseDecreaseThroughTreasuryShareTransactionsEquityShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseThroughSharesIssuedUnderIncentivePlans" id="aciu_IncreaseThroughSharesIssuedUnderIncentivePlans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutOtherCurrentReceivablesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutOtherCurrentReceivablesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PaymentsProceedsFromPurchasesSalesOfShortTermFinancialAssetsClassifiedAsInvestingActivities" id="aciu_PaymentsProceedsFromPurchasesSalesOfShortTermFinancialAssetsClassifiedAsInvestingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WithholdingTaxReceivables" id="aciu_WithholdingTaxReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AccruedExpensesAbstract" id="aciu_AccruedExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AlphaSynucleinPetImagingDiagnosticAgentMember" id="aciu_AlphaSynucleinPetImagingDiagnosticAgentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FollowOnGrantFundingReceived" id="aciu_FollowOnGrantFundingReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FollowOnGrantFundingReceivedTotalForJointArrangement" id="aciu_FollowOnGrantFundingReceivedTotalForJointArrangement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromSaleOfTreasurySharesInPublicOfferingsNetOfUnderwritingFeesAndTransactionCosts" id="aciu_ProceedsFromSaleOfTreasurySharesInPublicOfferingsNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsForShareIssueCostsAssociatedWithIssuanceOfSharesInRelationToAssetAcquisitions" id="aciu_PaymentsForShareIssueCostsAssociatedWithIssuanceOfSharesInRelationToAssetAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AssetAcquisitionsAxis" id="aciu_AssetAcquisitionsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAssetAcquisitionsTotalDomain" id="aciu_SignificantAssetAcquisitionsTotalDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAcquiredAsPartOfAssetAcquisition" id="aciu_CashAcquiredAsPartOfAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="IntangibleAssetsAcquiredAsPartOfAssetAcquisition" id="aciu_IntangibleAssetsAcquiredAsPartOfAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="TotalAssetsAcquiredInAssetAcquisition" id="aciu_TotalAssetsAcquiredInAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="SharesTransferredAsConsiderationInAssetAcquisition" id="aciu_SharesTransferredAsConsiderationInAssetAcquisition" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalConsiderationTransferredAcquisitionDateFairValueAssetAcquisition" id="aciu_TotalConsiderationTransferredAcquisitionDateFairValueAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="IprDIntangibleAssetAssociatedWithAci7104.056Member" id="aciu_IprDIntangibleAssetAssociatedWithAci7104.056Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetAcquisitionsAbstract" id="aciu_AssetAcquisitionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAssetAcquisitionsAxis" id="aciu_SignificantAssetAcquisitionsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllSignificantAssetAcquisitionsDomain" id="aciu_AllSignificantAssetAcquisitionsDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProgramPortfolioOfTherapeuticsTargetingAsynFromAffirisMember" id="aciu_ProgramPortfolioOfTherapeuticsTargetingAsynFromAffirisMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MiscellaneousOtherCurrentReceivables" id="aciu_MiscellaneousOtherCurrentReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="MaturityPeriodOtherCurrentReceivables" id="aciu_MaturityPeriodOtherCurrentReceivables" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfNumberOfTreasurySharesOutstandingAbstract" id="aciu_ReconciliationOfNumberOfTreasurySharesOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DecreaseInNumberOfTreasurySharesFromSalesOrIssuance" id="aciu_DecreaseInNumberOfTreasurySharesFromSalesOrIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfAdditionalSharesThatBoardOfDirectorsAreAuthorizedToIssue" id="aciu_NumberOfAdditionalSharesThatBoardOfDirectorsAreAuthorizedToIssue" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AdditionalShareCapitalThatBoardOfDirectorsAreAuthorizedToIssue" id="aciu_AdditionalShareCapitalThatBoardOfDirectorsAreAuthorizedToIssue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PotentialIncreaseIsEquityThroughConversionOfDebtInstruments" id="aciu_PotentialIncreaseIsEquityThroughConversionOfDebtInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PotentialNumberOfSharesIssuedFromConversionOfDebtInstruments" id="aciu_PotentialNumberOfSharesIssuedFromConversionOfDebtInstruments" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CapitalAuthorizedToBeIssuedUnderShelfRegistrationStatement" id="aciu_CapitalAuthorizedToBeIssuedUnderShelfRegistrationStatement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfConvertibleNoteAgreements" id="aciu_NumberOfConvertibleNoteAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IfNotesAreConvertedMember" id="aciu_IfNotesAreConvertedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AggregatePrincipalAmountOfEachConvertibleNote" id="aciu_AggregatePrincipalAmountOfEachConvertibleNote" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ProceedsFromConversionOfConvertibleDebtPerIndividualNote" id="aciu_ProceedsFromConversionOfConvertibleDebtPerIndividualNote" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OutstandingEquityOrCashConsiderationDueUnderConvertibleNoteAgreements" id="aciu_OutstandingEquityOrCashConsiderationDueUnderConvertibleNoteAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OtherAccruedExpenses" id="aciu_OtherAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="Quarter32019Member" id="aciu_Quarter32019Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="March312020Member" id="aciu_March312020Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UponFirstPatientDosedInPhase2ClinicalStudyOfLicensedProductInU.s.OrEu.Member" id="aciu_UponFirstPatientDosedInPhase2ClinicalStudyOfLicensedProductInU.s.OrEu.Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementUpfrontPaymentsReceived" id="aciu_CollaborativeAgreementUpfrontPaymentsReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ClinicalMilestonesMember" id="aciu_ClinicalMilestonesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RegulatoryAndSalesBasedMilestonesMember" id="aciu_RegulatoryAndSalesBasedMilestonesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AdvanceSmallMoleculePdProgramsMember" id="aciu_AdvanceSmallMoleculePdProgramsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResearchAndDevelopmentExpensesMember" id="aciu_ResearchAndDevelopmentExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeBenefitsExpenseExcludingShareBasedCompensation" id="aciu_EmployeeBenefitsExpenseExcludingShareBasedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TaxEffectOfIncomeNotSubjectToTaxAndExpensesNotDeductibleForTaxPurposes" id="aciu_TaxEffectOfIncomeNotSubjectToTaxAndExpensesNotDeductibleForTaxPurposes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RightOfUseAssetsAndLeaseLiabilitiesNetMember" id="aciu_RightOfUseAssetsAndLeaseLiabilitiesNetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RetirementBenefitPlanMember" id="aciu_RetirementBenefitPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="December312025Member" id="aciu_December312025Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="December312026Member" id="aciu_December312026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="December312027Member" id="aciu_December312027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="December312028Member" id="aciu_December312028Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="December312029Member" id="aciu_December312029Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInTaxLossesAvailableForOffsetAgainstFutureTaxableProfits" id="aciu_IncreaseDecreaseInTaxLossesAvailableForOffsetAgainstFutureTaxableProfits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlansPercentageOfContributionsByEmployees" id="aciu_DefinedBenefitPlansPercentageOfContributionsByEmployees" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlansPercentageOfContributionsByEmployer" id="aciu_DefinedBenefitPlansPercentageOfContributionsByEmployer" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromBenefitsDeposited" id="aciu_IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromBenefitsDeposited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ActuarialAssumptionOfInterestRateOnRetirementSavingsCapital" id="aciu_ActuarialAssumptionOfInterestRateOnRetirementSavingsCapital" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ActuarialAssumptionOfInterestRateOnSavingsCapitalMember" id="aciu_ActuarialAssumptionOfInterestRateOnSavingsCapitalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageRemainingContractualLifeOfShareOptionsExercisable" id="aciu_WeightedAverageRemainingContractualLifeOfShareOptionsExercisable" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Chf0.15Member" id="aciu_Chf0.15Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Chf9.53Member" id="aciu_Chf9.53Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Usd5.04ToUsd12.30Member" id="aciu_Usd5.04ToUsd12.30Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Usd2.76ToUsd4.57Member" id="aciu_Usd2.76ToUsd4.57Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockUnitsFirstVestingConditionsMember" id="aciu_RestrictedStockUnitsFirstVestingConditionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockUnitsSecondVestingConditionsMember" id="aciu_RestrictedStockUnitsSecondVestingConditionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsOutstanding" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsForfeited" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsForfeited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsExercised" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsGranted" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsGranted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsVested" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsVested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsVestedAndExercisable" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsVestedAndExercisable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ContractualCapitalCommitmentsOtherThanForLeases" id="aciu_ContractualCapitalCommitmentsOtherThanForLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OtherCurrentReceivablesMember" id="aciu_OtherCurrentReceivablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermLeaseLiabilitiesMember" id="aciu_LongTermLeaseLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" id="aciu_PercentageOfReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleIncreaseOrDecreaseInInterestRates" id="aciu_PercentageOfReasonablyPossibleIncreaseOrDecreaseInInterestRates" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" id="aciu_IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleIncreaseOrDecreaseInInterestRates" id="aciu_IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleIncreaseOrDecreaseInInterestRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAssetAcquisitionsTextBlock" id="aciu_DisclosureOfAssetAcquisitionsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAssetAcquisitionsTableTextBlock" id="aciu_DisclosureOfAssetAcquisitionsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfCashAndCashEquivalentsByCurrencyTableTextBlock" id="aciu_ScheduleOfCashAndCashEquivalentsByCurrencyTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAmountsRecognisedInBalanceSheetFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInBalanceSheetFromDefinedBenefitPlansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAmountsRecognisedInStatementOfProfitAndLossFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInStatementOfProfitAndLossFromDefinedBenefitPlansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfAmountsRecognisedInStatementOfOtherComprehensiveIncomeFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInStatementOfOtherComprehensiveIncomeFromDefinedBenefitPlansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOrIssueOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" id="aciu_SaleOrIssueOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfCashAndCashEquivalentsAndShortTermDepositsNotClassifiedAsCashEquivalentsTextBlock" id="aciu_DisclosureOfCashAndCashEquivalentsAndShortTermDepositsNotClassifiedAsCashEquivalentsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShortTermDepositsNotClassifiedAsCashEquivalentsTableTextBlock" id="aciu_ScheduleOfShortTermDepositsNotClassifiedAsCashEquivalentsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfTradeAndOtherPayablesAndAccruedExpensesTextBlock" id="aciu_DisclosureOfTradeAndOtherPayablesAndAccruedExpensesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTextBlock" id="aciu_DisclosureOfPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransactionCostsAssociatedWithSaleOfTreasurySharesInPublicOfferingRecordedInAccruedExpenses" id="aciu_TransactionCostsAssociatedWithSaleOfTreasurySharesInPublicOfferingRecordedInAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AdditionalGrantAwarded" id="aciu_AdditionalGrantAwarded" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ItAndLaboratoryEquipmentMember" id="aciu_ItAndLaboratoryEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Usd2.03ToUsd2.32Member" id="aciu_Usd2.03ToUsd2.32Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="December312030Member" id="aciu_December312030Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOrIssueOfPublicOfferingsNetOfUnderwritingFeesTransactionCost" id="aciu_SaleOrIssueOfPublicOfferingsNetOfUnderwritingFeesTransactionCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromIssuanceOfPublicOfferingsOfCommonSharesNetOfUnderwritingFeesAndTransactionCosts" id="aciu_ProceedsFromIssuanceOfPublicOfferingsOfCommonSharesNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TransactionCostAndStampDutyAssociatedWithPublicOfferingsOfCommonSharesRecordedInAccruedExpenses" id="aciu_TransactionCostAndStampDutyAssociatedWithPublicOfferingsOfCommonSharesRecordedInAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfSharesIssuedUponExerciseOfOptionsAndRestrictedShareUnits" id="aciu_NumberOfSharesIssuedUponExerciseOfOptionsAndRestrictedShareUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FollowOnOfferingMember" id="aciu_FollowOnOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementMileStonePaymentReceived" id="aciu_CollaborationAgreementMileStonePaymentReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IfrsSubsequentEventTypeAxis" id="aciu_IfrsSubsequentEventTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="IfrsSubsequentEventTypeDomain" id="aciu_IfrsSubsequentEventTypeDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProceedsFromPublicOfferingsNetOfUnderwritingFeesAndTransactionEquityShares" id="aciu_ProceedsFromPublicOfferingsNetOfUnderwritingFeesAndTransactionEquityShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="JJInnovativeMedicineMember" id="aciu_JJInnovativeMedicineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProceedsFromIssuanceOfCommonSharesInConnectionToAssetAcquisitions" id="aciu_ProceedsFromIssuanceOfCommonSharesInConnectionToAssetAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NumberOfSharesIssuedDuringPeriod" id="aciu_NumberOfSharesIssuedDuringPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NetProceedsFromIssuanceOfShares" id="aciu_NetProceedsFromIssuanceOfShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DecreaseInResearchAndDevelopmentExpenseThroughReductionsInVariousCostCenters" id="aciu_DecreaseInResearchAndDevelopmentExpenseThroughReductionsInVariousCostCenters" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DecreaseInGeneralAndAdministrativeExpenseThroughReductionsInVariousCostCenters" id="aciu_DecreaseInGeneralAndAdministrativeExpenseThroughReductionsInVariousCostCenters" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IncreaseInResearchAndDevelopmentExpenseThroughIncreaseInSalariesAndRelatedCosts" id="aciu_IncreaseInResearchAndDevelopmentExpenseThroughIncreaseInSalariesAndRelatedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ReceiptOfMilestonePaymentsMember" id="aciu_ReceiptOfMilestonePaymentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="IncreaseInGeneralAndAdministrativeExpenseThroughIncreaseInShareBasedCompensationExpense" id="aciu_IncreaseInGeneralAndAdministrativeExpenseThroughIncreaseInShareBasedCompensationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ConditionalShareCapitalForFinancingAndOtherPurposesMember" id="aciu_ConditionalShareCapitalForFinancingAndOtherPurposesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DisclosureOfAccountsReceivableTableTextBlock" id="aciu_DisclosureOfAccountsReceivableTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
