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Multidimensional on-line sample preparation of verapamil and its metabolites by a molecularly imprinted polymer coupled to liquid chromatography–mass spectrometry

Chromatography–mass SpectrometryBiochemistrySample PreparationMedicineBioanalysisMass SpectrometryAnalytical ChemistryLiquid ChromatographyMetabolomicsChromatographic AnalysisPharmacologyChromatographyDrug Analysis