The chemical Dienogest has a designated molecular formula of C20H25NO2 and a molecular weight of 311.425 g/mol. Synonyms may include: 17-alpha-Cyanomethyl-17-beta-hydroxyestra-4,9(10)-diene-3-one, 17-alpha-Cyanomethyl-17-beta-hydroxy-estra-4,9(10)-dien-3-one, Dienogestum [Latin], 17alpha-17-Hydroxy-3-oxo-19-norpregna-4,9-diene-21-nitrile, STS 557, Dienogestum, UNII-46M3EV8HHE, Dinagest, Dienogestril, Visanne (ChemID). Dienogest has been assigned a MeSH pharmacological action of: Antineoplastic, Hormone Antagonist.