Ledipasvir Impurity 21

Chemical Name:  Methyl ((S)-1-((1R,3S,4S)-3-(6-(7-(2-((S)-5-acetyl-5-azaspiro[2.4]heptan-6-yl)-1H-imidazol-5-yl)-9,9-difluoro-9H-fluoren-2-yl)-1H-benzo[d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptan-2-yl)-3-methyl-1-oxobutan-2-yl)carbamate

Smile: O=C(N[C@H](C(N1[C@@]2([H])C[C@@]([H])([C@H]1C3=NC4=CC=C(C=C4N3)C5=CC6=C(C=C5)C(C=CC(C7=CN=C(N7)[C@@H]8CC9(CC9)CN8C(C)=O)=C%10)=C%10C6(F)F)CC2)=O)C(C)C)OC