trisodium 3-[4-[[5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-2-sulphonatophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]naphthalene-1,5-disulphonate

3-[4-[[5-[(4-Amino-6-chloro-1,3,5-triazin-2-yl)amino]-2-sulfophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-1,5-naphthalenedisulfonic acid trisodium salt