The molecule is a withanolide that is 27-deoxywithaferin A substituted by a hydroxy group at position 19. Isolated from Physalis longifolia, it exhibits antineoplastic activity. It has a role as an antineoplastic agent. It is a delta-lactone, a 4-hydroxy steroid, an enone, an ergostanoid, a primary alcohol, a secondary alcohol, a withanolide and an epoxy steroid. It derives from a withaferin A.
(1S,2S,6S,7R,9R,11S,12S,15R,16S)-15-[(1S)-1-[(2R)-4,5-dimethyl-6-oxo-2,3-dihydropyran-2-yl]ethyl]-6-hydroxy-2-(hydroxymethyl)-16-methyl-8-oxapentacyclo[9.7.0.02,7.07,9.012,16]octadec-4-en-3-one