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

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