Synonyms: 2-Naphthalenecarboxamide,4,4'-[1,2-ethanediylbis[iminosulfonyl(6-methoxy-3,1-phenylene)azo]]bis[N-(5-chloro-2,4-dimethoxyphenyl)-3-hydroxy-(9CI); 2-Naphthanilide,4,4''-[ethylenebis[iminosulfonyl(6-methoxy-m-phenylene)azo]]bis[5'-chloro-3-hydroxy-2',4'-dimethoxy-(7CI,8CI)