1,3-Naphthalenedisulfonic acid, 7-amino-, ammonium potassium salt 1,3-Naphthalenedisulfonic acid, 7-amino-, monoammonium monopotassium salt 68213-88-7 86-65-7 Ammonium potassium 7-aminonaphthalene-1,3-disulphonate EINECS 269-271-2