Synonyms:
13-ethyl-17a-ethynyl-17-hydroxygon-5(10)-en-3-one ; 13-ethyl-17?-ethynyl-17-hydroxygon-5(10)-en-3-one ; 17-ethinyl-17-hydroxy-18-methylestr-5(10)-en-3-one ; 13-ethyl-17-hydroxy-18,19-dinorpregn-5(10)-en-20-yn-3-one ; 13-ethyl-17-hydroxy-18,19-dinor-17?-pregn-5(10)-en-20-yn-3-one(levonorgestrel impurity b) ; 18,19-dinorpregn-5(10)-en-20-yn-3-one,13-ethyl-17-hydroxy-, (17a)- (9ci) ; ep levonorgestrel impurity b ; (17?)-13-ethyl-17-hydroxy-18,19-dinorpregn-5(10)-en-20-yn-3-one ; 18,19-dinor-17a-pregn-5(10)-en-20-yn-3-one,13-ethyl-17-hydroxy- (7ci,8ci) ; 13-ethyl-17-hydroxy-18,19-dinor-17?-pregn-5(10)-en-20-yn-3-one ; 13-ethyl-17-hydroxy-18,19-dinor-17?-pregn-5(10)-en-20-yn-3-one
(levo norgestrel impurity) ; 13-ethyl-17-hydroxy-18,19-dinor-17a-pregn-5(10)-en-20-yn-3-one
(levo norgestrel impurity)