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

Abstract

In the title compound (kokosanolide B), C30H48O 3, the hexahydro-and octahydro-naphthalen-2-one ring systems are connected through an ethyl-ene fragment, with a C-CH2-CH 2-C torsion angle of 176.2 (2)°. The cyclo-hexene 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.