Synonyms: 2-Naphthalenecarboxamide, N,N'-(2,5-dichloro-1,4-phenylene)bis(4-(2-(2,5-dichlorophenyl)diazenyl)-3-hydroxy-;2-Naphthalenecarboxamide, N,N'-(2,5-dichloro-1,4-phenylene)bis(4-(2,5-dichlorophenyl)azo)-3-hydroxy-;(4Z,4'E)-N,N'-(2,5-dichlorobenzene-1,4-diyl)bis{4-[(2,5-dichlorophenyl)hydrazono]-3-oxo-3,4-dihydronaphthalene-2-carboxamide};N-[2,5-dichloro-4-[[4-(2,5-dichlorophenyl)azo-3-hydroxy-naphthalene-2-carbonyl]amino]phenyl]-4-(2,5-dichlorophenyl)azo-3-hydroxy-naphthalene-2-carboxamide