Acta Crystallographica E, Structure Reports Online vol:57 pages:O39-O40
In the title compound, C19H28O3, the ester linkage in ring A is equatorial. The six-membered rings A and B have chair conformations, but ring C can be better described as a half-chair. The five-membered ring D adopts a 14 alpha -envelope conformation. The A/B, B/C and C/D ring junctions are all trans. The packing of the molecules is assumed to be dictated mainly by intermolecular hydrogen bonds. There is an intramolecular C-H . . .O interaction between the O11 atom of the epoxy group and the methyl C18 group.