Abstract

Fourteen alkaloids were isolated from the trunk of Melodinus suaveolens. Thirteen of them were identified as Δ 14-vincine, vindolinine, 11-methoxytabersonine, vincadifformine, hazuntine, 11-hydroxytabersonine, 11-methoxyvineadifformine, cathovalinine, vincoline, 19 R-hydroxytabersonine, 11-methoxy-19 R-hydroxytabersonine, 11,19 R-dihydroxytabersonine and tabersonine. The last one is a new alkaloid, named suaveolenine; its structural elucidation was achieved by means of detailed spectral analysis.

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