The structure has been determined of a new alkaloid isolated from barks of Pausinystalia yohimbe. The compound is tetrahydro‐desmethyl‐corynantheine. Stereochemically it can be related to tetrahydro‐desmethoxy‐corynantheine alcohol, a compound described earlier by Karrer et al. Copyright © 1964 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim