130798-64-0 2,7-Naphthalenedisulfonic acid, 4,4'-((1,1'-biphenyl)-4,4'-diylbis(sulfonylimino))bis(5-hydroxy- 4,4'-(4,4'-Biphenyldiylbis(sulfonylamino))bis(5-hydroxy-2,7-naphthalenedisulfonic acid) 4,4'-Bps-bis(napss)