4-Hydroxy-17a-oxa-17a-homoandrost-4-ene-3,17-dione

The dihedral angles between ring planes of the title compound, C₁₉H₂₆O₄, a D-ring lactone, indicate a slightly curved molecular profile. All ring junctions are trans. A hydrogen bond between the hydroxyl group of ring A and the carbonyl group of ring D links the molecules head-to-tail in helical chains parallel to the 2₁ screw axis along a.

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