55698-27-6 Disodium 4'-((4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl)azo)-3',5-dimethyl-4-((4-(((4-methylphenyl)sulphonyl)oxy)phenyl)azo)(1,1'-biphenyl)-3-sulphonate EINECS 259-764-0