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

摘要

14,17 beta -ethano-14 beta -estratriene and estratetraene of Formula I IMAGE (I) wherein R1 is a hydrogen atom, a methyl or an acyl group of a monocarboxyclic acid of 1-12 carbon atoms, R2 is a hydrogen atom or an acyl group of a monocarboxylic acid of 1-12 carbon atoms, R3 is a hydrogen atom or a methyl group, and IMAGE is a single or double C-C-bond show strong estrogenic activity.