Three new withanolides, physagulins E(1), F(2), and G(3) were isolated from the fresh berries of Physalis angulate L. (Solanaceae). Their structures were established as (20S, 22R)-15α-acetoxy-5α, 6β, 14α, 28-tetrahydroxy-1-oxowitha-2, 16, 24-trienolide-28-O-D-glucopyranoside (1), (20R, 22R)-15α-acetoxy-16β, 17β-epoxy-5α, 6β-14β-trihydroxy-1-oxo-witha-2, 24-dienolide (2) and (20R, 22R)-15α-acetoxy-16β, 17β-epoxy-5α, 6β, 14β, 28-tetrahydroxy-1-oxo-witha-2, 24-dienolide 28-O-β-D-dlucopyranoside (3) by spectroscopic means.
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Shingu et al. (1992) studied this question.