sodium 4-[4-[[4-[[benzyl(p-tolyl)sulphonyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-3,5-dichlorobenzenesulphonate

3,5-Dichloro-4-[[4,5-dihydro-3-methyl-4-[[4-[[(4-methylphenyl)sulfonyl](phenylmethyl)amino]phenyl]azo]-5-oxo-1H-pyrazol]-1-yl]benzenesulfonic acid sodium salt