2-[[8-[(4-aminobenzoyl)amino]-1-hydroxy-3,6-disulpho-2-naphthyl]azo]naphthalene-1,5-disulphonic acid

2-[[8-[(4-Aminobenzoyl)amino]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-1,5-naphthalenedisulfonic acid