2,7-Naphthalenedisulfonic acid, 5-((5-chloro-6-methyl-2-(methylsulfonyl)-4-pyrimidinyl)amino)-4-hydroxy-3-((2-sulfophenyl)azo)-, potassium sodium salt 4-((5-Chloro-4-methyl-2-(methylsulfonyl)-6-pyrimidyl)amino)-5-hydroxy-6-((2-sulfophenyl)azo)-2,7-naphthalenedisulfonic acid, sodium, potassium salt 5-((5-Chloro-6-methyl-2-(methylsulphonyl)-4-pyrimidinyl)amino)-4-hydroxy-3-((2-sulphophenyl)azo)naphthalene-2,7-disulphonic acid, potassium sodium salt 72639-36-2 EINECS 276-754-1