Ring-C aromatic steroids. Part 5. C-17 Hydroxylation and side-chain degradation of 18-nor-17?(H)- and -17?(H)-pregna-4,8,11,13-tetraene-3,20-dione. X-Ray structure of 17?-hydroxy-18-nor-17?(H)-pregna-4,8,11,13-tetraene-3,20-dione

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