Synonyms: 1H-Pyrazole-3-carboxylicacid, 4,5-dihydro-5-oxo-4-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1-(4-sulfophenyl)-(9CI); 2-Pyrazoline-3-carboxylic acid,4-[[p-[(2-hydroxyethyl)sulfonyl]phenyl]azo]-5-oxo-1-(p-sulfophenyl)-, hydrogensulfate (7CI); 2-Pyrazoline-3-carboxylic acid, 4-[[p-[(2-hydroxyethyl)sulfonyl]phenyl]azo]-5-oxo-1-(p-sulfophenyl)-,hydrogen sulfate (ester) (8CI);4,5-Dihydro-5-oxo-4-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylicacid