7-[[2-[(Aminocarbonyl)amino]-4-[(2,3-dibromo-1-oxopropyl)amino]phenyl]azo]1,3-naphthalenedisulfonic acid

7-[[2-[(aminocarbonyl)amino]-4-[(2,3-dibromo-1-oxopropyl)amino]phenyl]azo]naphthalene-1,3-disulphonic acid