2-[[1-(6-chloro-o-tolyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonic acid

2-[[[1-(2-Chloro-6-methylphenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-4-yl]azo]-1-naphthalenesulfonic acid