OEH 6823

3-Methoxycarbonyl-4-(5-[3-Methoxycarbonyl-5-hydroxy-1-(2′,5′-disulfophenyl)-1H-pyrazole-4-yl]-2,4-pentadienyliden)-4,5-dihydro-5-oxo-1-(2′,5′-disulfophenyl)-1H-pyrazole, tetra-potassiuM salt

1H-Pyrazole-3-carboxylic acid, 1-(2,5-disulfophenyl)-4-[5-[1-(2,5-disulfophenyl)-1,5-dihydro-3-(methoxycarbonyl)-5-oxo-4H-pyrazol-4-ylidene]-1,3-pentadienyl]-5-hydroxy-, 3-methyl ester, tetrapotassium salt