4-((2-Carboxyphenyl)azo)-1-(2-chlorophenyl)-3-methyl-5-oxo-1H-pyrazole, sodium salt 72639-38-4 Benzoic acid, 2-((1-(2-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-, sodium salt