The isolation from Physalis pubescence of a new withanolide (now named pubescenol) and physalin E and its acetate is reported. The structure of pubescenol was shown to be 2,3-dihydro-4α,7α-dihydroxy-1-oxo-24α,25α-epoxywithanolide on the basis of its 1H n.m.r., high resolution mass, c.d., and o.r.d. spectra
K. S. Reddy, L. R. Row and T. Matsuura, J. Chem. Soc., Perkin Trans. 1, 1985, 419 DOI: 10.1039/P19850000419
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