7-Oxogedunin

Abstract

The title compound, 1-(3-furyl)-4b,7,7,10a,12a-penta­methyl-1,6a,7,10a,10b,11,12,12a-octa­hydro­naphtho­[2,1-f]­oxireno­[2,3-d]­isochromene-3,5,8(3aH,4bH,6H)-trione, C26H30O6, has been isolated from Xyl­ocarpus granatum Koenig. All four rings are trans-fused. The four six-membered rings adopt distorted sofa, chair, twist-boat and half-chair conformations. The furan substituent is planar and attached equatorially to the lactone ring of the gedunin skeleton. The crystal structure is stabilized by C—H⋯O intramolecular and intermolecular interactions.