1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis- 15999-06-1 2,2'-Dimethoxy-4,4'-bis(4,8-disulfo-2-naphthylazo)-5,5'-dimethyldiphenylurea 3,3'-(Carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(naphthalene-1,5-disulphonic) acid 851808-05-4 EINECS 240-132-8