disodium 2,5-dichloro-4-[4,5-dihydro-3-methyl-5-oxo-4-[(4-sulphonato-o-tolyl)azo]-1H-pyrazol-1-yl]benzenesulphonate

2,5-Dichloro-4-[[4,5-dihydro-3-methyl-4-[[2-methyl-4-(sodiooxysulfonyl)phenyl]azo]-5-oxo-1H-pyrazol]-1-yl]benzenesulfonic acid sodium salt