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There are two independent mol­ecules in the asymmetric unit of the title compound, C 30 H 44 O 5 . They comprise a triterpenoid skeleton of five six-membered rings and a five-membered lactone ring. The five six-membered rings are all  trans -fused. In both independent mol­ecules the  D  rings adopt a slightly distorted half-chair conformation due the presence of the lactone ring while the other four six-membered rings all adopt chair conformations. The characteristic carbon–carbon double bond of the oleanoic skeleton is absent. Inter­molecular O—H⋯O hydrogen bonds between the hy­droxy and carbonyl groups occur in the crystal structure.

12α-Hydroxy-3,27-dioxooleanano-28,13-lactone