4-[5-[3-Carboxy-5-hydroxy-1-(4-sulfophenyl)-1H-pyrazol-4-yl]-2,4-pentadienylidene]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid

4-[5-[3-carboxy-5-hydroxy-1-(4-sulphophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid