18,19-Dinor-17a-pregna-4,9-dien-20-yn-3-one,13-ethyl-17-hydroxy- (7CI,8CI); 17a-Ethynyl-13-ethyl-3-oxo-4,9-estradien-17b-ol; 17b-Hydroxy-18-methyl-19-nor-4,9-pregnadien-20-yn-3-one; RU 3714
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