Abstract
The crystal and the molecular structure of the steroidal oxadiazole 20-oximo-5α-pregnano-16-eno[3,4-C]-1′,2′,5′-oxadiazole (C21H28N2O3) has been determined by direct methods, and refined to a finalR of 0.086 for 3100 observed reflections. The compound crystallizes in space groupP21, with cell dimensionsa=18.284(6),b=13.992(4),c=7.370(3)A,β=96.97(3)°;V=1885 A3,Z=4,Dx=1.27 g cm−3, λ=1.5418 A, μ(CuKα=5.95 cm−1. The two independent molecules are related by a pseudo twofold axis. Both molecules exhibit similar overall topography, rings A, B, C, and D adopting distorted sofa, chair, chair, and distorted envelope conformations, respectively.
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