17-alpha-Chloroethinyl-17-beta-hydroxyestra-4,9-dien-3-one 17-alpha-Chloroethynyl-17-beta-hydroxy-19-nor-4,9-androstadien-3-one 17-alpha-Chloroethynyl-19-nor-4,9-androstadien-17-beta-ol-3-one 19-Nor-17-alpha-pregna-4,9-dien-20-yn-3-one, 21-chloro-17-hydroxy- 19-Norpregna-4,9-dien-20-yn-3-one, 21-chloro-17-hydroxy-, (17alpha)- 21-Chloro-17-hydroxy-19-nor-17alpha-pregna-4,9-dien-20-yn-3-one 3124-93-4 BRN 2011016 ETHYNERONE Ethynerone [USAN:INN] Ethyneronum [INN-Latin] Etinerona [INN-Spanish] MK 665