Chemical Name: (3E)-13β-ethyl-3-(hydroxyimino)-18,19-dinor-17α-pregn-4-en-20-yn-17-ol (as per EP)
Synonym: (E)-norelgestromin
Smiles: CC[C@@]12[C@@](C#C)(O)CC[C@@]1([H])[C@@](CCC3=C/C4=N/O)([H])[C@]([C@@]3([H])CC4)([H])CC2
Inchi: InChI=1S/C21H28O2/c1-3-20-11-9-17-16-8-6-15(22)13-14(16)5-7-18(17)19(20)10-12-21(20,23)4-2/h2,13,16-19,23H,3,5-12H2,1H3/t16-,17+,18+,19-,20-,21-/m0/s1