113825-74-4 2,7-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino-4,1-phenyleneazo))bis(4-amino-5-hydroxy-6-(phenylazo)-, tetrasodium salt 59262-64-5 EINECS 261-682-5 Tetrasodium 3,3'-(carbonylbis(imino-p-phenyleneazo))bis(4-amino-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate)