102272-33-3 72829-13-1 Benzenesulfonic acid, 4-(4-((4-((4-((4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl)azo)benzoyl)amino)phenyl)azo)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-, disodium salt Disodium p-(4-((4-((4-((4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl)azo)benzoyl)amino)phenyl)azo)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonate EINECS 276-905-1