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5-[[5-chloro-6-methyl-2-(methylsulphonyl)-4-pyrimidinyl]amino]-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt  Structure

5-[[5-chloro-6-methyl-2-(methylsulphonyl)-4-pyrimidinyl]amino]-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt