Synonyms: 1H-Pyrazole-3-carboxylic acid, 4-[3-[3-(ethoxycarbonyl)-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]-1-propenyl]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, 3-ethyl ester, dipotassium salt;1H-Pyrazole-3-carboxylic acid,4-[3-[3-(ethoxycarbonyl)-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]-1-propenyl]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-,3-ethyl ester,dipotassium salt