Chemical Name£º1-Pyrrolidinecarboxylic acid, 2,2'.-([1,1'.-biphenyl]-4,4'.-diyldi-1H-iMidazole-5,2-diyl)bis-, 1,1'.-bis(1,1-diMethylethyl) ester, (2S,2'.S)- CAS NO. :1007882-23-6 Structural Formula: Use: Intermediates of Daclatasvir 3