5,20α(R)-dihydroxy-6α,7α-epoxy-1-oxo-(5α) witha-2,24-dienolide, a new steroidal lactone from Withania coagulans. - Subramanian,S.S.; Sethi,P.D.; Glotter,E.; Kirson,I.; Lavie,D. (Phytochemistry, 1971)