4-{4,5-Dihydro-4-{[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]-me

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

p-[4,5-dihydro-4-[[5-hydroxy-3-methyl-1-(4-sulphophenyl)-1H-pyrazol-4-yl]methylene]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonic acid