Simultaneous determination of levophencynonate and its metabolite demethyl levophencynonate in human plasma by liquid chromatography tandem mass spectrometry
Keywords: HPLC–MS/MS, high performance liquid chromatography tandem mass spectrometry; ESI, electro-spray ionization; LLOQ, lower limit of quantitation; LPH, levophencynonate; DMLPH, demethyl levophencynonate; d3-LPH, d3-levophencynonate; IS, internal standard; QC,