17-Hydroxy-3-oxo-19-nor-17alpha-pregna-4,9-diene-21-nitrile 17-alpha-Cyanomethyl-17-beta-hydroxy-estra-4,9(10)-dien-3-one 17-alpha-Cyanomethyl-17-beta-hydroxyestra-4,9(10)-diene-3-one 17alpha-17-Hydroxy-3-oxo-19-norpregna-4,9-diene-21-nitrile 19-Norpregna-4,9-diene-21-nitrile, 17-hydroxy-3-oxo-, (17-alpha)- 65928-58-7 Dienogest Dienogest [INN] Dienogestum [Latin] STS 557