Acta Cryst. (2002). E58, o874-o876  [ doi:10.1107/S1600536802011844 ]

Melampodinone

F. R. Fronczek and N. H. Fischer

Abstract: The title compound, methyl {1aS-[1aR*,2aR*,3aR*,4E,5aS*,8aR*,9R*(2S*,3S*),9aR*]}-9-{[(2,3-dimethyloxiranyl)carbonyl]oxy}-2a,3a,5a,7,8,8a,9,9a-octahydro-4-methyl-8-methylene-2,7-dioxobisoxireno[4,5:7,8]cyclodeca[1,2-b]furan-1a(2H)-carboxylate, C₂₁H₂₂O₁₀, is an oxidation product of melampodin A. It has Z' = 2, and the conformations of the ten-membered rings in the two molecules are quite similar, with a mean difference of 2.4° between endocyclic torsion angles.

Online 19 July 2002

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