(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

In the title compound, C19H28O2, 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 CH2C(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