Chemical Name: 3-Oxo-19-nor-17α-pregn-4-en-20-yn-17-yl acetate (as per EP); 17-Hydroxy-19-nor-17α-pregn-4-en-20-yn-3-one acetate (as per USP)
Synonym: (2S)-Narirutin ; (2S)-7-[[6-O-(6-Deoxy-a-L-mannopyranosyl)-b-D-glucopyranosyl]oxy]-2,3-dihydro-5-hydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one;
Smile: O=C1CC[C@]2([H])[C@@]3([H])CC[C@]4(C)[C@@](C#C)(OC(C)=O)CC[C@@]4([H])[C@]3([H])CCC2=C1