CAS: 68-22-4 Molecular Formula: C20H26O2 Molecular Weight (g/mol): 298.42 InChI Key: VIKNJXKGJWUCNN-XGXHKTLJSA-N Synonym: norethindrone,norethisterone,norethisteron,micronor,19-norethisterone,norcolut,noriday,norlutin,primolut-n,norethynodrone PubChem CID: 6230 ChEBI: CHEBI:7627 IUPAC Name: (8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-13-methyl-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one SMILES: CC12CCC3C(C1CCC2(C#C)O)CCC4=CC(=O)CCC34