disodium 2-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]benzoate

2-[[[1-(2-Chloro-5-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-4-yl]azo]benzoic acid disodium salt