Ledipasvir Impurity 6

Chemical Name: Methyl ((R)-1-((R)-6-(5-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-1H-imidazol-2-yl)-5-azaspiro[2.4]heptan-5-yl)-3-methyl-1-oxobutan-2-yl)carbamate

Smile: O=C(OC)N[C@H](C(C)C)C(N([C@@H](C1=NC=C(C2=CC(C(F)(F)C3=C4C=CC(Br)=C3)=C4C=C2)N1)C5)CC65CC6)=O