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Simultaneous determination of amphetamine and methamphetamine enantiomers in urine by simultaneous liquid–liquid extraction and diastereomeric derivatization followed by gas chromatographic–isotope dilution mass spectrometry

Methamphetamine EnantiomersGas ChromatographyMedicineDrug PurityMass SpectrometryDrug TestSimultaneous Liquid–liquid ExtractionAnalytical ChemistryDiastereomeric DerivatizationLiquid ChromatographyPharmacologyChromatographyDrug Analysis