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Accurate identification and quantification of 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid in urine drug testing: Evaluation of a direct high efficiency liquid chromatographic–mass spectrometric method

Cannabis Use11-Nor-δ9-tetrahydrocannabinol-9-carboxylic AcidBiochemistryMedicineMass SpectrometryDrug TestingDrug TestAnalytical ChemistryAccurate IdentificationDrug ScreeningUrine Drug TestingPharmacologyChromatographyDrug Analysis