11,12-Dihy­droxy-10,6,8,11,13-icetexapentan-1-one

The title compound [systematic name: 14,15-dihy­droxy-7,7-dimethyl-13-(propan-2-yl)tricyclo­[9.4.0.0(3,8)]penta­deca-1(11),3(8),9,12,14-pentaen-4-one], C(20)H(24)O(3), is a new icetexane diterpenoid which was isolated from the roots of Premna obtusifolia (Verbenaceae). The mol­ecule has three fused rings: a cyclo­hexenone, a central cyclo­heptene and a benzene ring. The cyclo­hexenone ring is in an envelope conformation, whereas the cyclo­heptene ring is in a twisted boat conformation. Intra­molecular O—H⋯O hydrogen bonds generate S(5) and S(8) ring motifs. In the crystal, mol­ecules are linked into dimers through O—H⋯O hydrogen bonds. These dimers are arranged in to sheets parallel to the ac plane. C—H⋯O and weak C—H⋯π inter­actions are also present.