Nomegestrol Clinical data Other names 19-Normegestrol; 6-Methyl-17α-hydroxy-δ 6-19-norprogesterone; 17α-Hydroxy-6-methyl-19-norpregna-4,6-diene-3,20-dione ATC code Identifiers
(17α)-17-acetyl-17-hydroxy-6-methylestra-4,6-dien-3-one CAS Number PubChem CID ChemSpider KEGG Chemical and physical data Formula C 21 H 28 O 3 Molar mass 328.445 g/mol g·mol −1 3D model ( JSmol)
Nomegestrol ( ), also known as INN 19-normegestrol, is a steroidal progestin which was patented in 1975 but was never marketed.  It is the parent compound of  nomegestrol acetate, which is marketed as a progestin. 
Nomegestrol shows relatively low
affinity for the progesterone receptor, only about 4% of that of progesterone and about 1.6% of that of nomegestrol acetate in one assay.
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