3,6-bis[(4-bromo-2-sulphophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulphonic acid

3,6-Bis(4-bromo-2-sulfophenylazo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid, 3,6-bis(4-Bromo-2-sulfophenylazo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid