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Withaferiii A, C,,H,,O,, isolated along with its dihydro-derivative from the leaves of Withania S o m n i f e Y a Dun. (Solanaceae), has been shown to possess structure (I). The compound previously called withaferin has now been identified as 2,3-dihydro-3-methoxywithaferin A.* Dihydrowithaferin A is identical with the naturally occurring compound previously described as A,.

1709 and 1695 cm-l. These data suggest two apunsaturated carbonyl systems in (IV), the double bond of one being easily reduced (IV) +-(XII). This information could be completed by inspection of the n.m.r. spectrum of (IV). In the low-field region there are two signals for vinylic hydrogens at 6 5.81 and 6.60 p.p.m. which, according to their position and * Withanone, a compound of unknown structure isolated from Withania somnifera (collected in India, Delhi area) 5a has been found to be identical with compound (IV) 66.