Figure 2.
Mass spectra of humantenirine (a), humantenine (b), akuammidine (c), gelsevirine (d), rankinidine (e), n-methoxyanhydrovobasinediol (f), gelsenicine (g), gelsemine (h), koumine (i), koumidine (j), sempervirine (k), and strychnine (IS, l).
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