trisodium 4-[[4-chloro-6-[(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-5-hydroxy-6-[(2-sulphonatophenyl)azo]naphthalene-1,7-disulphonate

4-[[4-Chloro-6-[(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-5-hydroxy-6-[(2-sulfophenyl)azo]-1,7-naphthalenedisulfonic acid trisodium salt