7-((2-((Aminocarbonyl)amino-4-((4-chloro-6-(methyl(3(or 4)-sulfophenyl)amino)-1,3,5-triazin-2-yl)amino)phenyl)azo)-1,3,6-naphthalene trisulfonic acid sodium salt

A mixture (50/50) of: tetrasodium 7-(4-[4-chloro-6-[methyl-(3-sulfonatophenyl)amino]-1,3,5-triazin-2-ylamino]-2-ureidophenylazo)naphthalene-1,3,6-trisulfonate tetrasodium 7-(4-[4-chloro-6-[methyl-(4-sulfonatophenyl)amino]-1,3,5-triazin-2-ylamino]-2-urei