29973-06-6 BRN 2192570 Butanoic acid, 2-(((4-(((carboxymethyl)methylamino)carbonyl)-2,3,5,6-tetraiodobenzoyl)amino)methyl)- alpha-(4-(N-Methyl-N-carboxymethyl-carbamoyl)-2,3,5,6-tetrajod-benzoylamidomethyl)buttersaure