disodium 4-[[5-chloro-6-methyl-2-(methylsulphonyl)-4-pyrimidinyl]amino]-5-hydroxynaphthalene-2,7-disulphonate

4-[[5-Chloro-6-methyl-2-(methylsulfonyl)-4-pyrimidinyl]amino]-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt