(+-)-21-Chloro-13-ethyl-17-hydroxy-18,19-dinor-17-alpha-pregn-4-en-20-yn-3-one 17A-CHLOROETHYNYL-13-ETHYL-17-HYDROXYGON-4-EN-3-ONE,DL- 18,19-Dinor-17-alpha-pregn-4-en-20-yn-3-one, 21-chloro-13-ethyl-17-hydroxy-, (+-)- 2415-28-3 Wy 4355 dl-17-alpha-Chloroethynyl-13-beta-ethyl-17-beta-hydroxygon-4-en-3-one