Not Available,Methyl {(2S)-1-[(2S,5S)-2-(9-{2-[(2S,4R)-1-{(2R)-2-[(methoxycarbonyl)amino]-2- phenylacetyl}-4-(methoxymethyl)-2-pyrrolidinyl]-1H-imidazol-4-yl}-1,11- dihydroisochromeno[4',3':6,7]naphtho[1,2-d]imidazol -2-yl)-5-methyl-1-pyrrolidinyl]- 3-methyl-1-oxo-2-butanyl}carbamate,Impurity in commercial preparations of Velpatasvir,Velpatasvir Impurity