2-Naphthalenecarboxamide,4,4'-[1,2-ethanediylbis[iminosulfonyl(6-methoxy-3,1-phenylene)azo]]bis[N-(4-ethoxyphenyl)-3-hydroxy-(9CI); 2-Naphtho-p-phenetidide,4,4''-[ethylenebis[iminosulfonyl(6-methoxy-m-phenylene)azo]]bis[3-hydroxy-(6CI); C.I. 212855; C.I. Pigment Red 164; Helio Fast Red GG; Pigment Red 164