Four new withanolide glycosides (1-4) have been isolated from Physalis peruviana. Their structures were established as (20R, 22R)-1α-acetoxy-14α, 20-dihydroxywitha-5, 24-dienolide-3β-(O-β-D-glucopyranoside) (1), (20S, 22R)-1α-acetoxy-27-hydroxywitha-5, 24-dienolide-3β-(O-β-D-glucopyranoside) (2), (20R, 22R)-20, 27-dihydroxy-1-oxowitha-5, 24-dienolide-3β-(O-β-D-glucopyranoside) (3), and (20R, 22R)-14α, 20, 27-trihydroxy-1-oxowitha-5, 24-dienolide-3β-(O-β-D-glucopyranoside) (4) on the basis of spectroscopic data including two dimensional NMR techniques and through chemical transformations.
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Ahmad et al. (1999) studied this question.