Synonyms: 5b-Ergosta-2,24-dien-26-oic acid,5,6b-epoxy-4b,22,27-trihydroxy-1-oxo-, d-lactone, (20S,22R)- (8CI);Withaferin A (7CI); 5,6-Epoxy-5H-cyclopenta[a]phenanthrene,ergosta-2,24-dien-26-oic acid deriv.; NSC 101088; NSC 273757; Withaferine;Withaferine A