1,5-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(sulfonylimino)]bis- 130798-66-2 (FREE ACID) 130798-67-3 (TETRASODIUM SALT) AIDS-002508 AIDS002508 N,N'-bis[4,8-Disulfo]naphth-2-yl-4,4'-biphenylsulfonamide