Pentasodium 4-(3-(3-carboxylato-5-oxido-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl)allylidene)-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate;pentasodium 4-{(1E,3E)-3-[3-carboxylato-5-oxo-1-(4-sulfonatophenyl)-1,5-dihydro-4H-pyrazol-4-ylidene]prop-1-en-1-yl}-5-oxido-1-(4-sulfonatophenyl)-1H-pyrazole-3-carboxylate
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