Chemical Name : 13β-ethyl-17β-hydroxy-18,19-dinor-17α-pregn-4-en-20-yn-3-one (as per EP)

Smiles : CC[C@@]12[C@@](C#C)(O)CC[C@@]1([H])[C@@](CCC3=CC4=O)([H])[C@]([C@@]3([H])CC4)([H])CC2