The structure of withaphysalin C, a new naturally occurring steroidal lactone of the withanolide group, isolated from Physalis minima(Solanaceae), has been elucidated. This is a 13,14-seco-steroid closely related to withaphysalin A. The lack of a 17α-OH precluded the formation of a 17 → 14 hemiacetal as in the physalins, leading to the alternative formation of a 13 → 14 hemiacetal.
I. Kirson, Z. (V. I.) Zaretskii and E. Glotter, J. Chem. Soc., Perkin Trans. 1, 1976, 1244 DOI: 10.1039/P19760001244
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