Not Less Than - 95%
13-Ethyl-11-methylidene-18,19-dinor-17α-pregn-4-en-20-yn-17-ol (as per EP) ; 13-Ethyl-11-methylene-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol (as per USP); 13-Ethyl-11-methylene-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol