Chemical Name : 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-17α-pregn-4-en-20-yn-17-ol (as per USP)

Smiles : C=C1C[C@@]2(CC)[C@](CC[C@@]2(O)C#C)([H])[C@]3([H])CCC4=CCCC[C@]4([H])[C@]31[H]