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The structures of two new bis-indole alkaloids, 19'(R)-hydroxyconodurine (11) and 19'(R)-hydroxyconoduramine (12), from the leaves of Tabernaemontana subglobosa MERR. (Apocynaceae), native to Taiwan, were determined by means of spectroscopic analysis and chemical reactions.
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Takayama et al. (1994) studied this question.
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