1H-Pyrazole-3-carboxylic acid, 4-((4-(((3,6-dichloro-4-pyridazinyl)carbonyl)amino)-2-sulfophenyl)azo)-4,5-dihydro-5-oxo-1-(4-sulfophenyl)- 4-((4-(((3,6-Dichloropyridazin-4-yl)carbonyl)amino)-2-sulphophenyl)azo)-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid 68399-88-2 EINECS 269-995-9