14-Hy­droxy-8,14-secogammacera-7-ene-3,21-dione from the bark of Lansium domesticum Corr.

Abstract

In the title compound (kokosanolide B), C30H48O3, the hexa­hydro- and octa­hydro­naphthalen-2-one ring systems are connected through an ethyl­ene fragment, with a C—CH2—CH2—C torsion angle of 176.2 (2)°. The cyclo­hexene ring adopts a half-chair conformation, while the other six-membered rings adopt distorted chair conformations. In the crystal, adjacent mol­ecules are linked into a zigzag chain along the b axis by O—H⋯O hydrogen bonds involving the hy­droxy and carbonyl groups