Synonyms: 4,4'-bis[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-1H-pyrazol-4-yl]azo][1,1'-biphenyl]-2,2'-disulphonic acid;4,4'-Bis[[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol]-4-yl]azo][1,1'-biphenyl]-2,2'-disulfonic acid;4,4'-Bis((4,5-dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-1H-pyrazol-4-yl)azo)(1,1'-biphenyl)-2,2'-disulphonic acid;Einecs 283-567-9