Abstract of the Disclosure14,17.beta.-ethano-14.beta.-estratriene and estratetraene of Formula I(I),whereinR1 is a hydrogen atom, a methyl or an acyl group of amonocarboxyclic acid of 1 - 12 carbon atoms,R2 is a hydrogen atom or an acyl group of a monocarboxylicacid of 1 - 12 carbon atoms,R3 is a hydrogen atom or a methyl group, and is a single or double C-C-bondshow strong estrogenic activity.
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