disodium p-[4,5-dihydro-4-[[5-hydroxy-3-methyl-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]methylene]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate

4-[[4,5-Dihydro-4-[[5-hydroxy-3-methyl-1-[4-(sodiooxysulfonyl)phenyl]-1H-pyrazol-4-yl]methylene]-3-methyl-5-oxo-1H-pyrazol]-1-yl]benzenesulfonic acid sodium salt