disodium 4-[(chloroacetyl)amino]-2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]benzenesulphonate

4-[(Chloroacetyl)amino]-2-[[[1-[2,5-dichloro-4-(sodiosulfo)phenyl]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-4-yl]azo]benzenesulfonic acid sodium salt