20-Epiheyneanine, an epimer of the known iboga alkaloid heyneanine, is the major base of the root bark of Peschiera affinis. It is accompanied by lesser quantities of coronatidine, coronaridine pseudoindoxyl, affinisine and olivacine, as well as sitosterol, β-amyrin, lupeol and 3-O-acetyllupeol. © 1976.