Indole alkaloids isolated from Gelsemium elegans (Thailand): 19-(Z)-akuammidine, 16-epi-voacarpine, 19-hydroxydihydrogelsevirine, and the revised structure of koumidine.

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Abstract
Structures of the new indole alkaloids, 19- (Z) -akuammidine, 16-epi-voacarpine, 19-hydroxydihydrogelsevirine isolated from the root of Gelsemium elegans have been determined by the spectral method, X-ray analysis and chemical correlation. Koumidine was revised to show the 19- (Z) ethylidene configuration in the structure.

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