1-Naphthylamine-4,6-disulfonic acid, EINECS 201-629-5, 4-Aminonaphthalene-1,7-disulphonic acid, 1-amino-4,6-disulpho-naphthalene, 4-amino-1,7-naphthalenedisulphonic acid, 1,7-Naphthalenedisulfonic acid,4-amino, Naphthylamin-(1)-disulfonsaeure-(4.6), 4-Amino-naphthalin-1,7-disulfonsaeure, 4-AMINO-1,7-NAPHTHALENEDISULFONIC ACID, 4-amino-naphthalene-1,7-disulfonic acid, 1,7-Naphthalenedisulfonic acid, 4-amino-