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In the title compound, C 19 H 28 O 2 , the  A  ring adopts a chair conformation, and each of the  B  and  C  rings adopts a distorted half-chair conformation with the methine C atom in the CH 2 C(H)C(=O) residue, common to both rings, lying 0.6397 (19) and 0.6328 (18) Å out of the approximate plane defined by the remaining five C atoms (r.m.s. deviations = 0.0791 and 0.0901 Å for rings  B  and  C , respectively). Helical supra­molecular chains along the  a  axis mediated by hy­droxy–carbonyl O—H⋯O hydrogen bonds feature in the crystal packing.

(4R,4aS,4bS,7R,10aR)-4-Hydroxy-4a,7-dimethyl-2-(propan-2-yl)-1,4,4a,4b,5,6,7,8,10,10a-decahydrophenanthren-1-one