6-Hydroxy­salvinolone

The title compound {systematic name: 5,6,10-trihydr­oxy-7-iso­propyl-1,1,4a-trimethyl-2,3,4,4a-tetra­hydro­phenanthren-9(1H)-one}, C(20)H(26)O(4), is a diterpenoid which was isolated from the roots of Premna obtusifolia. The mol­ecule has three fused six-membered rings; the cyclo­hexane ring is in a twisted-boat conformation and the cyclo­hexene ring adopts a sofa form. Intra­molecular O—H⋯O hydrogen bonds generate two S(5) ring motifs. In the crystal, mol­ecules are linked into infinite one-dimensional chains along the [001] direction by O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions.