13,13-Ethylenedithio-3-mesyloxy-18-nor-13,17-secoestra-1,3,5(10)-triene-17-nitrile

In the course of the partial synthesis of 18-norestradiol, an X-ray analysis of an appropriately crystallizing intermediate, C₂₀H₂₅NO₃S₃, was carried out in order to determine its absolute configuration. The unusual D-secosteroid displays configurations at C8, C9 and C14 not altered in comparison with the starting material, estrone.

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