3α-Hydroxy-ent-atis-16-en-14-one

Abstract

The title compound, C20H30O2, 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].