3-Pyridinemethanesulfonic acid, 5-((5-((4-chloro-6-((3-sulfophenyl)amino)-1,3,5-triazin-2-yl)amino)-2-sulfophenyl)azo)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-, trisodium salt 89923-43-3