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The data for the proposed structure of isochimonanthine, a dimeric pyrrolidinoindoline alkaloid that was synthesized from tryptamine, were not identical with those of the natural product. Careful structure reinvestigationled to the conclusion that the so-called isochimonanthine was a ca. 1:1 mixture of (+)-chimonanthine and meso-chimonanthine.
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Takayama et al. (2005) studied this question.
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