1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, sodium salt 3,3'-(Carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(1,5-naphthalenedisulfonic acid), sodium salt 3,3'-(Carbonylbis(imino(5-methoxy-2-methyl-p-phenylene)azo))bis(naphthalene-1,5-disulphonic) acid, sodium salt 68109-69-3 EINECS 268-483-2