Synonyms: 1H-Benzimidazolium,5,6-dichloro-2-[3-[5,6-dichloro-1-ethyl-1,3-dihydro-3-(4-sulfobutyl)-2H-benzimidazol-2-ylidene]-1-propenyl]-1-ethyl-3-(4-sulfobutyl)-,inner salt (9CI);5,6-Dichloro-2-[3-[5,6-dichloro-1-ethyl-3-(4-sulfobutyl)-2-benzimidazolinylidene]propenyl]-1-ethyl-3-(4-sulfobutyl)benzimidazoliumhydroxide inner salt (6CI,7CI); Benzimidazolium,5,6-dichloro-2-[3-[5,6-dichloro-1-ethyl-3-(4-sulfobutyl)-2-benzimidazolinylidene]propenyl]-1-ethyl-3-(4-sulfobutyl)-,hydroxide, inner salt (8CI); Benzimidazolocarbocyanine hydroxide,anhydro-5,5',6,6'-tetrachloro-1,1'-diethyl-3,3'-disulfobutyl- (8CI);1,1'-Diethyl-3,3'-bis(4-sulfobutyl)-5,5',6,6'-tetrachlorobenzimidazolocarbocyanine;5,5',6,6'-Tetrachloro-1,1'-diethyl-3,3'-bis(4-sulfobutyl)benzimidazolocarbocyanine;5,5',6,6'-Tetrachloro-1,1'-diethyl-3,3'-di(4-sulfobutyl)benzimidocarbocyanine;5,6-Dichloro-2-[3-[5,6-dichloro-1-ethyl-3-(4-sulfobutyl)-2-benzimidazolinylidene]propenyl]-3-ethyl-1-(4-sulfobutyl)benzimidazoliumhydroxide inner salt; Anhydr