Chemical Name : 13-Ethyl-17-hydroxy-11-methylidene-18,19-dinor-17α-pregn-4-en-20-yn-3-one (as per EP); 13-Ethyl-11-methylene-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol-3-one (as per USP)

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