Two new indole alkaloids, melodinoxanine (1) and N b -methylnortetraphyllicine (2), were isolated from the stems and leaves of Melodinus henryi growing in Yunnan, China.Melodinoxanine (1) is a unique oxindole alkaloid with an extra oxygen atom in the C-ring of a heteroyohimbine skeleton.
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Takayama et al. (2012) studied this question.
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