1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, lithium potassium sodium salt 1,5-Naphthalenedisulfonic acid, 3,3'-(ureylenebis((5-methoxy-2-methyl-p-phenylene)azo))di-, lithium potassium sodium salts 83864-12-4 96294-15-4