Chemical Name : 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregna-4,15-dien-20-yne-3,6-dione (as per EP)

Smiles : O=C1CC[C@@]2([H])C(C(C[C@]3([H])[C@]2([H])CC[C@@]4(CC)[C@@]3([H])C=C[C@@]4(O)C#C)=O)=C1