The molecule is a withanolide saponin that consists of withaferin A attached to a alpha-L-rhamnopyranosyl(1->4)-beta-D-glucopyranosyl residue via a glycosidic linkage. Isolated from the aerial parts of Physalis longifolia, it exhibits antineoplastic activity. It has a role as an antineoplastic agent and a plant metabolite. It is a withanolide saponin, a 4-hydroxy steroid, a disaccharide derivative, a delta-lactone, an ergostanoid and an epoxy steroid. It derives from a withaferin A.
(1S,2R,6S,7R,9R,11S,12S,15R,16S)-15-[(1S)-1-[(2R)-5-[[(2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl]oxymethyl]-4-methyl-6-oxo-2,3-dihydropyran-2-yl]ethyl]-6-hydroxy-2,16-dimethyl-8-oxapentacyclo[9.7.0.02,7.07,9.012,16]octadec-4-en-3-one