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

4-[[4,5-Dihydro-4-[3-[[5-hydroxy-3-methyl-1-(4-sodiosulfophenyl)-1H-pyrazol]-4-yl]-2-propenylidene]-3-methyl-5-oxo-1H-pyrazol]-1-yl]benzenesulfonic acid sodium salt