Chemical Name : 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregna-4,6-dien-20-yn-3-one (as per EP)

Smiles : C#C[C@]1(O)CC[C@@]2([H])[C@]3([H])C=CC4=CC(CC[C@]4([H])[C@@]3([H])CC[C@@]21CC)=O