Synonyms: 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-4-(2-(4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)diazenyl)-1-(4-sulfophenyl)-, sodium salt (1:?);1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-4-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-1-(4-sulfophenyl)-, sodium salt;4,5-Dihydro-5-oxo-4-((4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, sodium salt;trisodium 5-oxo-4-[(E)-(4-{[2-(sulfonatooxy)ethyl]sulfonyl}phenyl)diazenyl]-1-(4-sulfonatophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylate