Swietenolide diacetate from the seeds of Swietenia macrophylla

The title compound, C₃₁H₃₈O₁₀ [systematic name: (αR,4R,4aR,6aS,7R,8S,10R,11S)-methyl α,10-di­acet­oxy-4-(3-furyl)-4a,7,9,9-tetra­methyl-2,13-dioxo-1,4,4a,5,6,6a,7,8,9,10,11,12-dodeca­hydro-7,11-methano-2H-cyclo­octa­[f][2]benzo­pyran-8-acetate], was isolated from the seeds of Swietenia macrophylla. The mol­ecule contains four six-membered rings connected together in the shape of a bowl; one of the inner rings adopts a twisted chair conformation owing to the carbon–carbon double bond. The furyl substitutent is connected to an outer ring, and it points away from the bowl cavity.