83984-89-8 EINECS 281-611-1 Tetrasodium 2-((5-(aminocarbonyl)-1,6-dihydro-4-methyl-2-oxido-6-oxo-1-(2-(4-sulphonatophenyl)ethyl)-3-pyridyl)azo)-5-((3-phosphonatophenyl)azo)benzenesulphonate