The crystal structure of the title compound (C₂₇H₄₅NO₂) has been determined by X-ray crystallographic techniques. The compound crystallizes in the monoclinic space group P2₁ with unit cell parameters a = 12.143(2), b =10.835(2), c = 19.747(4) Å, β = 101.29(1)°. The structure has been solved by direct methods and refined to R=0.064. There are two crystallographically independent molecules, I and II, in the asymmetric unit. In both the molecules, rings A, B and C are conformationally very similar, however pronounced differences are observed in the D ring which assumes a distorted envelope conformation in molecule I and a distorted half-chair conformation in molecule II. The A/B ring junction is quasi-trans while ring systems B/C and C/D are trans fused in both the molecules I and II. Two bifurcated intramole-cular hydrogen bonds have been observed. Molecules are held together by intermolecular C-H...O hydrogen bonds.

Keywords: X-ray crystallography, crystal structure, steriod, conformations

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