trisodium 2-[4-[[4-[[4-[(4-amino-2-methylphenyl)azo]benzoyl]amino]-3-sulphonatophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzene-1,4-disulphonate

2-[[4-[[4-[[4-[(4-Amino-2-methylphenyl)azo]benzoyl]amino]-3-(sodiosulfo)phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-1-yl]-1,4-benzenedisulfonic acid disodium salt