Chemical Name : 13-Ethyl-3-ethynyl-18,19-dinor-17α-pregna-3,5-dien-20-yn-17-ol (as per EP)

Smiles : C#C[C@]1(O)CC[C@@]2([H])[C@]3([H])CC=C4C=C(C#C)CC[C@]4([H])[C@@]3([H])CC[C@@]21CC