Determination of levophencynonate and its metabolite demethyl levophencynonate in human urine by HPLC-MS/MS*
QI Wen-yuan, LI Bo, XUE Wei, YANG Lei, LI Ke-xin, SHI Ai-xin
Chinese Journal of Pharmaceutical Analysis . 2021, (5): 809 -816 .  DOI: 10.16155/j.0254-1793.2021.05.07