3,3'-[2,2'-Dimethyl-1,1'-biphenyl-4,4'-diylbis[azo(5-oxo-4,5-dihydro-3-methyl-1H-pyrazole-4,1-diyl)]]bis[2-hydroxy-5-sodiosulfobenzoic acid sodium] salt | 3,3'-[2,2'-Dimethyl-1,1'-biphenyl-4,4'-diylbis[azo(5-oxo-4,5-dihydro-3-methyl-1H-pyrazole-4,1-diyl)]]bis[2-hydroxy-5-sodiosulfobenzoic acid sodium] salt | |