disodium 6-amino-5-[[5-[(2-bromo-1-oxoallyl)amino]-2-sulphonatophenyl]azo]naphthalene-2-sulphonate

6-Amino-5-[5-(2-bromo-1-oxo-2-propenylamino)-2-(sodiosulfo)phenylazo]-2-naphthalenesulfonic acid sodium salt