disodium 7-[[4-[[4-[(4-aminobenzoyl)amino]-o-tolyl]azo]phenyl]azo]naphthalene-1,3-disulphonate

7-[[4-[[4-[(4-Aminobenzoyl)amino]-2-methylphenyl]azo]phenyl]azo]-1,3-naphthalenedisulfonic acid disodium salt