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UPLC-MS/MS chromatograms of humantenirine, humantenine, akuammidine, gelsevirine, rankinidine, n-methoxyanhydrovobasinediol, gelsenicine, gelsemine, koumine, koumidine, sempervirine, and strychnine (IS) in rat plasma: (a) blank rat plasma; (b) blank rat plasma spiked with 11 Gelsemium alkaloids and IS.
