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  <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_HaiscoPharmaceuticalGroupCoLtdUpfrontPaymentMember" abstract="true" name="HaiscoPharmaceuticalGroupCoLtdUpfrontPaymentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="aqst_WarrantsLiabilityAbstract" abstract="true" name="WarrantsLiabilityAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_ManufacturingAndSupplyMember" abstract="true" name="ManufacturingAndSupplyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_SeniorSecuredNotesAbstract" abstract="true" name="SeniorSecuredNotesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_AgreementToTerminateCLAWithKemPharmMember" abstract="true" name="AgreementToTerminateCLAWithKemPharmMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_CumulativeRoyaltyReceivable" abstract="false" name="CumulativeRoyaltyReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" 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_ProceedsFromSaleOfFutureRevenuesNet" abstract="false" name="ProceedsFromSaleOfFutureRevenuesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_CoverageDuration" abstract="false" name="CoverageDuration" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_RepurchaseOfferPercentageOfCashProceedsReceived" abstract="false" name="RepurchaseOfferPercentageOfCashProceedsReceived" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="aqst_AccountsReceivableAllowancesCreditsAndPayments" abstract="false" name="AccountsReceivableAllowancesCreditsAndPayments" nillable="true" xbrli:periodType="duration" 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-types:domainItemType"/>
  <xs:element id="aqst_CoDevelopmentAndResearchFeesMember" abstract="true" name="CoDevelopmentAndResearchFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_NetProceedsFromIssuanceOfInitialNotesWarrantsAndFirstOfferRights" abstract="false" name="NetProceedsFromIssuanceOfInitialNotesWarrantsAndFirstOfferRights" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" 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_NumberOfOperatingLeases" abstract="false" name="NumberOfOperatingLeases" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_CashPaymentRepresenting90DaysOfBasePay" abstract="false" name="CashPaymentRepresenting90DaysOfBasePay" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_HaiscoPharmaceuticalGroupCoLtdMember" abstract="true" name="HaiscoPharmaceuticalGroupCoLtdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_ResearchAndDevelopmentProjectDuration" abstract="false" name="ResearchAndDevelopmentProjectDuration" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_ShareBasedCompensationArrangementNumberOfAnnualOfferingPeriods" abstract="false" name="ShareBasedCompensationArrangementNumberOfAnnualOfferingPeriods" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_AgreementTerm" abstract="false" name="AgreementTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_LicenseAgreementWithSunovionPharmaceuticalsIncMilestonesMember" abstract="true" name="LicenseAgreementWithSunovionPharmaceuticalsIncMilestonesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_PremiumsPaidEarlyRetirementOfDebt" abstract="false" name="PremiumsPaidEarlyRetirementOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_SecondAdditionalOfferingMember" abstract="true" name="SecondAdditionalOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_WarrantExercisesMember" abstract="true" name="WarrantExercisesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_DaysRequiredPriorToWrittenNotice" abstract="false" name="DaysRequiredPriorToWrittenNotice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_MaterialAgreementsAbstract" abstract="true" name="MaterialAgreementsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_SeverancePeriod" abstract="false" name="SeverancePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_NumberOfAnnualRoyaltyPaymentsReceivable" abstract="false" name="NumberOfAnnualRoyaltyPaymentsReceivable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_PublicEquityMember" abstract="true" name="PublicEquityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_SharesOfCommonStockToBePurchasedByCommonStockWarrants" abstract="false" name="SharesOfCommonStockToBePurchasedByCommonStockWarrants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <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_ProprietaryProductSalesMember" abstract="true" name="ProprietaryProductSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_IssuanceAxis" abstract="true" name="IssuanceAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" 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_CommonStockWarrantsMember" abstract="true" name="CommonStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_SupplementalAgreementWithIndiviorPerformanceOrEventBasedMilestonesMember" abstract="true" name="SupplementalAgreementWithIndiviorPerformanceOrEventBasedMilestonesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_SecuritiesPurchaseAgreementMember" abstract="true" name="SecuritiesPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_MarathonPangolinRoyaltyLLCMember" abstract="true" name="MarathonPangolinRoyaltyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_NumberOfGuaranteedRoyaltyPayments" abstract="false" name="NumberOfGuaranteedRoyaltyPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aqst_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockDiscountAmount" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockDiscountAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aqst_SaleOfFutureRevenueRollForward" abstract="true" name="SaleOfFutureRevenueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_MonetizationAgreementMember" abstract="true" name="MonetizationAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_LicenseSupplyAgreementMember" abstract="true" name="LicenseSupplyAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_NinthThroughEighteenthMonthMember" abstract="true" name="NinthThroughEighteenthMonthMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_AtTheMarketOfferingAmendmentOneMember" abstract="true" name="AtTheMarketOfferingAmendmentOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aqst_RoyaltyObligationActivityTableTextBlock" abstract="false" name="RoyaltyObligationActivityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="aqst_AutomaticRenewalPeriodOfAgreement" abstract="false" name="AutomaticRenewalPeriodOfAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aqst_RevenuesAndTradeReceivablesNetAbstract" abstract="true" name="RevenuesAndTradeReceivablesNetAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aqst_EighthMonthMember" abstract="true" name="EighthMonthMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_SaleOfFutureRevenueTextBlock" abstract="false" name="SaleOfFutureRevenueTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
</xs:schema>
