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Method for preparing 17 alpha-acetoxy-11beta-(4-n,n-dimethylaminophenyl)-19-norpregna-4,9-diene-3,20-dione, intermediates thereof, and methods for the preparation of such intermediates
Derives steroides 20-isonitriles 17(20) insatures, leur procede de preparation et leur utilisation a la preparation des steroides 17alpha-hydroxy 20-ceto.