4-((4,5-Dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazol-4-yl)azo)-4'-((1-(((2,4-dimethylphenyl)amino)carbonyl)-2-oxopropyl)azo)(1,1'-biphenyl)-2,2'-disulphonic acid 79665-31-9 EINECS 279-219-0