Abstract
The title compound crystallizes in space groupP212121 with lattice constantsa=16.253(3),b=17.107(3), andc=8.486(2) A. The A ring has 1α,2β-half-chair conformation. The calculated steric energy of a 6α-methyl-17α-ester progesterone molecule is lower by about 4 kJ/mol for the normal A-ring conformation. The progesterone side chain has typical conformation for 17α-ester steroids; the C(16)-C(17)-C(20)-O(20) torsion angle is −24.9(4)°.
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