Abstract
The title d-seco limonoid, named 1,3,7-trideacetylkhivorin (systematic name: 14,15β:21,23-diepoxy-1α,3α,7α-trihydroxy-4,4,8-trimethyl-d-homo-24-nor-17-oxochola-20,22-diene-16-one), C26H36O7, was isolated from the stem bark of African mahogany Khaya senegalensis (Meliaceae). The four fused six-membered rings adopt chair, chair, boat and half-chair conformations. The five-membered furan ring is disordered by a 180° rotation about the bond linking it to the pyran ring. The crystal structure is stabilized by strong classical O—H⋯O hydrogen-bond interactions to form a network.
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