1H-Pyrazole-3-carboxylic acid, 4-((5-((5-chloro-6-methyl-2-(methylsulfonyl)-4-pyrimidinyl)amino)-2-sulfophenyl)azo)-4,5-dihydro-1-(2-methyl-4-sulfophenyl)-5-oxo-, sodium salt 4-((5-((5-Chloro-4-methyl-2-(methylsulfonyl)-6-pyrimidyl)amino)-2-sulfophenyl)azo)-3-carboxy-1-(2-methyl-4-sulfophenyl)-5-oxo-1H-pyrazole, sodium salt 4-((5-((5-Chloro-6-methyl-2-(methylsulphonyl)-4-pyrimidinyl)amino)-2-sulphophenyl)azo)-4,5-dihydro-1-(2-methyl-4-sulphophenyl)-5-oxo-1H-pyrazole-3-carboxylic acid, sodium salt 72639-25-9 EINECS 276-748-9