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In the title compound, C 19 H 26 O 2 , the  A  ring adopts a chair conformation, whereas the  B  and  C  rings both adopt distorted half-chair conformations with the quaternary C atom common to both rings lying 0.577 (3) and 0.648 (3) Å out of the approximate plane defined by the remaining five C atoms (r.m.s. deviations = 0.1386 and 0.1156 Å) for the  B  and  C  rings, respectively. Mol­ecules are assembled in the crystal through C—H⋯O inter­actions involving both carbonyl O atoms, which lead to supra­molecular chains aligned along the  b  axis.

(4aS,4bR,7R,10aS)-3,7-Dimethyl-10a-(propan-2-yl)-1,4,4a,4b,5,6,7,8,10,10a-decahydrophenanthrene-1,4-dione