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