The title compound has been shown to be 6α,7α-epoxy-5α-hydroxy-1,12-dioxo-22R-witha-2,24-dienolide. This is the first natural 12-oxowithanolide isolated so far.
I. Kirson, D. Lavie, S. S. Subramanian, P. D. Sethi and E. Glotter, J. Chem. Soc., Perkin Trans. 1, 1972, 2109 DOI: 10.1039/P19720002109
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