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Online solid-phase extraction liquid chromatography–electrospray-tandem mass spectrometry analysis of buprenorphine and three metabolites in human urine

Human UrineBiochemistryGas ChromatographyMedicineNatural SciencesBioanalysisMass SpectrometryBiological Mass SpectrometryAnalytical ChemistryLiquid ChromatographyMetabolomicsChromatographic AnalysisPharmacologyOnline Solid-phase ExtractionChromatographyDrug Analysis