2-((4-((2-Amino-4-((4,5-dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-1H-pyrazol-4-yl)azo)-5-nitrophenyl)azo)phenyl)amino)-5-nitrobenzenesulphonic acid 85959-26-8 EINECS 289-017-4