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CAS: 68-22-4 Molecular Formula: C20 H26 O2 Molecular Weight (g/mol): 298.42 Synonym: Norethisterone Acetate Imp. A (EP),Levonorgestrel Imp. U (EP),(17α)-17-Hydroxy-19-Norpregn-4-en-20-yn-3-one,17-Hydroxy-19-nor-17α-pregn-4-en-20 yn-3-one,17α-Ethinyl-17β-hydroxy-δ4-estren-3-one,17α-Ethinyl-19-nortestosterone,17α-Ethinylestr-4-en-17β-ol-3-one,17α-Ethynyl-17-hydroxy-4-estrene-3-one,17α-Ethynyl-17-hydroxyest-4-en-3-one,17α-Ethynyl-17-hydroxyestr-4-en-3-one,17α-Ethynyl-17β-hydroxy-19-norandrost-4-en-3-one,17α-Ethynyl-17β-hydroxyestr-4-en-3-one,17α-Ethynyl-19-nor-androst-4-en-17β-ol-3-one,17α-Ethynyl-19-nortestosterone,17α-Ethynyl-3-oxo-4-estren-17β-ol,17β-Hydroxy-17α-ethynylestr-4-en-3-one,19-Nor-17α-ethynyl-17β-hydroxy-4-androsten-3-one,19-Nor-17α-ethynylandrosten-17β-ol-3-one,19-Nor-17α-ethynyltestosterone,19-Norandrost-4-en-3-one, 17α-ethynyl-17β-hydroxy-,19-Nortestosterone, 17-ethynyl-,Anovule,Conludaf,Conludag,Estr-4-ene-17α-ethynyl-17β-ol-3-one,Ethinylnortestosterone,Ethynylnortestosterone,Gestest,Menzol,Micronett,Micronor,Micronovum,Mini-Pe,Mini-pill,NSC 9564,Nor-QD,Noralutin,Norcolut,Norethindrone,Norethisteron,Norethisterone,Norethynodrone,Noretisterone Dak,Norfor,Norgestin,Norluten,Norlutin,Norluton,Normapause,Norpregneninolone,Primolut N,Proluteasi,SC 4640,Triella,Utovlan 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: C[C@]12CC[C@H]3[C@@H](CCC4=CC(=O)CC[C@H]34)[C@@H]1CC[C@@]2(O)C#C