2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dichloro(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-amino-4-hydroxy- 2,7-Naphthalenedisulfonic acid, 3,3'-dichloro-4,4'-biphenylylene)bis(azo))bis(5-amino-4-hydroxy- 3627-06-3 Afridol Blue