Pubescenol, a new withanolide from Physalis pubescence
Abstract
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