Three new withanolides, physagulins A (1), B (2) and D (3), were obtained from the methanolic extract of the fresh leaves and stems of Physalis angulata L. (Solanaceae). Their structures were established as (20S, 22R)-15α-acetoxy-5β, 6β-epoxy-14α-hydroxy-1-oxowitha-2, 16, 24-trienolide (1), (20S, 22R)-15α-acetoxy-5α-chloro-6β, 14α-dihydroxy-1-oxowitha-2, 16, 24-trienolide (2) and (20S, 22R)-1α, 3β, 27-trihydroxywitha-5, 24-dienolide 3-O-β-D-gluco-pyranoside (3) by spectroscopic means.
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Shingu et al. (1992) studied this question.