17-Hydroxy-19-nor-17-alpha-pregn-4-en-20-yn-3-one oxime 19-Nor-17-alpha-pregn-4-en-20-yn-3-one, 17-hydroxy-, oxime 19-Norpregn-4-en-20-yn-3-one, 17-hydroxy-, oxime, (17-alpha)- (9CI) 23965-86-8 BRN 2300127 Norethindrone 3-oxime Norethindrone oxime Norethisterone oxime Norethisterone-3-oxime SO-33