Synonyms: Norgestrel [USAN:INN:BAN:JAN]; (+-)-13-Ethyl-17-hydroxy-18,19-dinor-17alpha-pregn-4-en-20-yn-3-one; dl-13-beta-Ethyl-17-alpha-ethynyl-17-beta-hydroxygon-4-en-3-one; dl-13-beta-Ethyl-17-alpha-ethynyl-19-nortestosterone; 18,19-Dinor-17-alpha-pregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-, (+-)-; 18,19-Dinorpregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-,(17alpha)-(+-)-; Norgestrel (DL-)