2-Naphthalenesulfonic acid, 6-amino-5-((4-((2-bromo-1-oxo-2-propenyl)amino)-2-sulfophenyl)azo)-4-hydroxy-, disodium salt 70210-40-1 Disodium 6-amino-5-((4-((2-bromo-1-oxoallyl)amino)-2-sulphonatophenyl)azo)-4-hydroxynaphthalene-2-sulphonate EINECS 274-437-2