Synonyms:
17a-cyanomethyl-17b-hydroxyestra-4, 9-dien-3-one ; dienogest ; dienogestril ; sts 557 ; 17a-cyanomethyl-17-hydroxyestra-4, 9-dien-3-one ; 17α-cyanomethyl-17β-hydroxyestra-4,9-dien-3-one ; dinagest ; dienogestrel ; endometrion ; contraceptive (oral)