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The title compound, C 29 H 48 O, is a triterpenoid isolated from  Adiantum incisum forssk . In the crystal structure, the asymmetric unit contains two independent mol­ecules which are not significantly different. Each mol­ecule contains four six-membered rings, all adopting chair conformations, and a five-membered ring in an envelope conformation. In the mol­ecular structure, non-classical intra­molecular C—H⋯O hydrogen bonds are observed.

1-(5a,5b,8,8,11a,13b-Hexamethyleicosahydro-1H-cyclopenta[a]chrysen-3-yl)-1-ethanone