Two new steroidal lactones of the withanolide type, isolated from Withania somnifera Dun (Solanaceae), are characterized by the unusual presence of a C-23 hydroxy-group. Withanolide Q (1a) is (22S,23R)-17α,23,27-trihydroxy-1-oxowitha-2,5,24-trienolide and withanolide R (2a) is (22S,23R)-6α,7α-epoxy-5α,23-dihydroxy-1-oxowitha-2,24-dienolide.
I. Kirson, A. Cohen and A. Abraham, J. Chem. Soc., Perkin Trans. 1, 1975, 2136 DOI: 10.1039/P19750002136
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