17-Hydroxy-19-norpregn-20-yn-3-one (5-alpha,17-alpha)- 19-Nor-5-alpha,17-alpha-pregn-20-yn-3-one, 17-hydroxy- (6CI,7CI,8CI) 19-Norpregn-20-yn-3-one, 17-hydroxy-, (5-alpha,17-alpha)- 19-Norpregn-20-yn-3-one, 17-hydroxy-, (5alpha,17alpha)- 4-08-00-01116 (Beilstein Handbook Reference) 5-alpha-Dihydro-19-norethisterone 5-alpha-Dihydronorethindrone 5-alpha-Dihydronorethisterone 52-79-9 5alpha-Dihydronorethindrone BRN 3147588 NSC 85401 STS 737