Similar names: Norgestrel; rac-13-Ethyl-17-hydroxy-18,19-dinor-17a-pregn-4-en-20-yn-3-one; 18,19-Dinor-17α-pregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-, (±)- (8CI); (±)-13-Ethyl-17α-ethynyl-17-hydroxygon-4-en-3-one; (±)-17α-Ethynyl-13-ethyl-17-hydroxygon-4-en-3-one; (±)-17α-Ethynyl-13β-ethylgon-4-en-17β-ol-3-one; (±)-Norgestrel; 13-Ethyl-17α-ethynyl-17β-hydroxy-4-gonen-3-one; DL-Norgestrel; FH 122A; Methylnorethindrone; Monovar; Neogest; Norgestrel; Ovrette; Postinor; SH 70850; SH 850; Wy 3707; dl-11β-Ethyl-17α-ethynyl-17β-hydroxygon-4-en-3-one; dl-13-β-Ethyl-17-α-ethynyl-17-β-hydroxygon-4-en-3-one; dl-Norgestrel; α-Norgestrel