1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, lithium potassium sodium salt 1,3-Naphthalenedisulfonic acid, 7,7'-(ureylenebis((5-methoxy-2-methyl-p-phenylene)azo))di-, lithium potassium sodium salts 96294-14-3