19-Nor-5b,17a-pregn-20-yne-3a,17-diol (8CI); 17a-Ethinyl-5b-estrane-3a,17b-diol; 17a-Ethynyl-5b-estrane-3a,17b-diol; 17a-Ethynyl-5b-oestrane-3a,17b-diol; 3a,5b-Tetrahydronorethindrone; 3a,5b-Tetrahydronorethisterone
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