Chemical Name : 17-Hydroxy-19-nor-17α-pregn-4-en-20-yn-3-one (as per EP & USP)

Smiles : O=C1CC[C@]2([H])[C@@]3([H])CC[C@]4(C)[C@](O)(C#C)CC[C@@]4([H])[C@]3([H])CCC2=C1