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The title compound, C 20 H 30 O 2 , is an  ent -atisane diterpenoid which was isolated from the roots of  Euphorbia kansuensis . The mol­ecule contains five six-membered rings, among which three six-membered rings of the bicyclo­[2.2.2]octane unit adopt boat conformations and two cyclo­hexane rings adopt chair conformations. In the crystal structure, mol­ecules are connected by inter­molecular O—H⋯O hydrogen bonds, forming zigzag chains propagating parallel to [001].

3α-Hydroxy-ent-atis-16-en-14-one