Synonyms: | 2-[3-Carboxy-4-[5-[3-carboxy-5-oxo-1-(2-sodiosulfobenzyl)-2-pyrazolin-4-ylidene]-1,3-pentadienyl]-5-hydroxy-1H-pyrazol-1-ylmethyl]benzenesulfonic acid trisodium salt;4-[5-[3-Carboxy-5-hydroxy-1-[(2-sulfophenyl)methyl]-1H-pyrazol-4-yl]-2,4-pentadienylidene]-4,5-dihydro-5-oxo-1-[(2-sulfophenyl)methyl]-1H-pyrazole-3-carboxylic acid tetrasodium salt |