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)-,hydroxide, inner salt, sodium salt; 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, sodium salt (9CI); 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, sodium salt (8CI);5,5',6,6'-Tetrachloro-1,1'-diethyl-3,3'-bis(4-sulfobutyl)benzimidazolocarbocyaninesodium salt; S 0046