14,17 beta -ETHANO-14 beta -ESTRATRIENES AND ESTRATETRAENES, PROCESS FOR THEIR MANUFACTURE AND PHARMACEUTICAL PREPARATIONS CONTAINING THESE

摘要

Agents having an oestrogenic activity, containing a compound of general formula (I), where R<1> represents a hydrogen atom, a methyl group or an acyl group with 1 to 12 carbon atoms, R<2> represents a hydrogen atom or an acyl group with 1 to 12 carbon atoms, R<3> represents a hydrogen atom or a methyl group, (a) represents a single or double C-C- bond. These new compounds are suited for making preparations intended for contraception and treating oestrogen deficiency phenomena.