Epivernadol diacetate

In the crystal structure of the title compound, (4aR,5R,6S,7S,8aS)-methyl 8a-ethenylocta­hydro-5-acet­oxy-7-{[2-(acetoxy­meth­yl)-1-oxo-2-propen­yl]­oxy}-α,4-bis­(methyl­ene)-3-oxo-1H-2-benzopyran-6-acetate, C₂₄H₂₈O₁₀, the mol­ecule has a cis configuration at the junction of the two six-membered rings and not a trans configuration as was assigned on the basis of NMR data in solution [Asaka et al. (1977). Phytochemistry, 16, 1838–1839].