Sterols in vernonia anthelmintica seed

Abstract
The main sterol of Vernonia anthelmintica seed is 7,(Z)‐24(28)‐stigmastadienol (Ia). Stigmasterol and a C29‐sterol with a conjugated diene system, probably at C8 and C14, are also present, whilst GLC data indicate two other components to be 5‐stigmasten‐3β‐ol and 7,22‐stigmastadienol. A correlation of NMR data is given showing the stereochemistry at the ethylidene group of Ia and in related compounds.