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  <xs:element id="aqst_InterestAndOtherIncomeNet" abstract="false" name="InterestAndOtherIncomeNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_TradeAndOtherReceivablesNet" abstract="false" name="TradeAndOtherReceivablesNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_RepurchaseOfferPercentageOfCashProceedsReceived" abstract="false" name="RepurchaseOfferPercentageOfCashProceedsReceived" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="aqst_IssuanceAxis" abstract="true" name="IssuanceAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="aqst_AtTheMarketOfferingAmendmentOneMember" abstract="true" name="AtTheMarketOfferingAmendmentOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_AccountsReceivableAllowancesAndAccrualsAccountsPayableAndAccruedExpenses" abstract="false" name="AccountsReceivableAllowancesAndAccrualsAccountsPayableAndAccruedExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_ElectiveRedemptionPercentageOfDebt" abstract="false" name="ElectiveRedemptionPercentageOfDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="aqst_SalesRelatedAllowancesAndAccrualsTableTextBlock" abstract="false" name="SalesRelatedAllowancesAndAccrualsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="aqst_AccountsReceivableAllowancesAndAccrualsRollForward" abstract="true" name="AccountsReceivableAllowancesAndAccrualsRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_AdjustmentsToAdditionalPaidInCapitalFairValueOfWarrantsIssued" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalFairValueOfWarrantsIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_ManufacturingAndSupplyMember" abstract="true" name="ManufacturingAndSupplyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_LicenseAgreementTerm" abstract="false" name="LicenseAgreementTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_NetProceedsAfterPlacementAgentFeesExpensesAndOfferingExpensesPayable" abstract="false" name="NetProceedsAfterPlacementAgentFeesExpensesAndOfferingExpensesPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_LicenseAndRoyaltyRevenueMember" abstract="true" name="LicenseAndRoyaltyRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_RightToSellCommonStockValue" abstract="false" name="RightToSellCommonStockValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_ProprietaryProductSalesMember" abstract="true" name="ProprietaryProductSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="aqst_RedemptionPercentageOfDebtUnderChangeOfControlProvisions" abstract="false" name="RedemptionPercentageOfDebtUnderChangeOfControlProvisions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="aqst_WarrantExercisesMember" abstract="true" name="WarrantExercisesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_LicenseAgreementWithSunovionPharmaceuticalsIncMember" abstract="true" name="LicenseAgreementWithSunovionPharmaceuticalsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_AccountsReceivableAllowancesProvisionReversalRelatedToSales" abstract="false" name="AccountsReceivableAllowancesProvisionReversalRelatedToSales" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_NumberOfGuaranteedRoyaltyPayments" abstract="false" name="NumberOfGuaranteedRoyaltyPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_ExistingWarrantsMember" abstract="true" name="ExistingWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_SaleOfFutureRevenueTextBlock" abstract="false" name="SaleOfFutureRevenueTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="aqst_SeniorSecuredNotesAbstract" abstract="true" name="SeniorSecuredNotesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="aqst_AgreementTerm" abstract="false" name="AgreementTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_NewWarrantsMember" abstract="true" name="NewWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_WarrantsLiabilityAbstract" abstract="true" name="WarrantsLiabilityAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_AccountsReceivableAllowancesAndAccrualsTradeAndOtherReceivablesNet" abstract="false" name="AccountsReceivableAllowancesAndAccrualsTradeAndOtherReceivablesNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_EquityDistributionAgreementMember" abstract="true" name="EquityDistributionAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_RoyaltyObligationActivityTableTextBlock" abstract="false" name="RoyaltyObligationActivityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="aqst_ManufactureAndSupplyRevenueMember" abstract="true" name="ManufactureAndSupplyRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_MinimumAnnualRoyaltyReceivable" abstract="false" name="MinimumAnnualRoyaltyReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_LesseeOperatingLeaseLiabilityToBePaidYearFourAndThereafter" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidYearFourAndThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_TwelvePointFiveSeniorSecuredNotesDueJune302025Member" abstract="true" name="TwelvePointFiveSeniorSecuredNotesDueJune302025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_FirstSevenMonthsMember" abstract="true" name="FirstSevenMonthsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_InterestExpenseSaleOfFutureRevenuesExcludingAmortization" abstract="false" name="InterestExpenseSaleOfFutureRevenuesExcludingAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_HaiscoPharmaceuticalGroupCoLtdUpfrontPaymentMember" abstract="true" name="HaiscoPharmaceuticalGroupCoLtdUpfrontPaymentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_DaysOfBasePay" abstract="false" name="DaysOfBasePay" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_LiabilitiesSaleOfFutureRoyalties" abstract="false" name="LiabilitiesSaleOfFutureRoyalties" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_DurationOfPaymentAxis" abstract="true" name="DurationOfPaymentAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="aqst_SaleOfFutureRevenueRollForward" abstract="true" name="SaleOfFutureRevenueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognizedNoncurrent" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognizedNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_LiabilitiesSaleOfFutureRoyaltiesCurrent" abstract="false" name="LiabilitiesSaleOfFutureRoyaltiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_InducementEquityCommonStockOptionsOutstandingShares" abstract="false" name="InducementEquityCommonStockOptionsOutstandingShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="aqst_LincolnParkAgreementMember" abstract="true" name="LincolnParkAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_EighthMonthMember" abstract="true" name="EighthMonthMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="aqst_NumberOfInstallments" abstract="false" name="NumberOfInstallments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_SeverancePeriod" abstract="false" name="SeverancePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
