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The title compound, C 20 H 26 O 2 , was isolated from a chloro­form extract of  Tetra­clinis articulata  wood. The mol­ecule contains three fused rings which exhibit different conformations. The non-aromatic oxo-substituted ring has a screw-boat conformation, while the central ring has a half-chair conformation. In the crystal, mol­ecules are linked to each other by inter­molecular O—H⋯O hydrogen bonds involving the carbonyl and hy­droxy groups.

7-Hydroxy-8-isopropyl-1,1,4a-trimethyl-4a,9,10,10a-tetrahydro-phenanthren-2(1H)-one