2,7-Naphthalenedisulfonic acid, 5-4-(2-bromo-1-oxo-2-propenyl)aminobenzoylamino-3-5-(2-bromo-1-oxo-2-propenyl)amino-2-sulfophenylazo-4-hydroxy-, trisodium salt
5-[4-(2-Bromo-1-oxo-2-propenylamino)benzoylamino]-3-[5-(2-bromo-1-oxo-2-propenylamino)-2-(sodiosulfo)phenylazo]-4-hydroxy-2,7-naphthalenedisulfonic acid disodium salt