2,7-Naphthalenedisulfonic acid, 4-((3-aminobenzoyl)amino)-5-hydroxy- 4-((3-Aminobenzoyl)amino)-5-hydroxynaphthalene-2,7-disulphonic acid 5-(m-Aminobenzoylamino)-4-hydroxy-2,7-naphthalenedisulfonic acid 68189-31-1 EINECS 269-188-1