ent-5α,3,15-Dioxodolabr-4(18)-ene-16,18-diol

The title compound, C(20)H(30)O(4), is a dolabrane diterpenoid isolated from Ceriops tagal, in which one of the three fused cyclo­hexane rings adopts a half-chair conformation and the other two are in the standard chair conformations. The hy­droxy­methyl­idene substituent is attached to the half-chair cyclo­hexane. An intra­molecular O—H⋯O hydrogen bond generate an S(6) ring motif. In the crystal, mol­ecules are arranged into screw chains along the [001] direction. The crystal is stabilized by O—H⋯O hydrogen bonds and weaker C—H⋯O inter­actions.