Synonyms: 1H-Benzimidazolium,5,6-dichloro-2-[3-[5,6-dichloro-1-ethyl-1,3-dihydro-3-(3-sulfopropyl)-2H-benzimidazol-2-ylidene]-1-propenyl]-1-ethyl-3-(3-sulfopropyl)-,inner salt, sodium salt (9CI); Benzimidazolium, 5,6-dichloro-2-[3-[5,6-dichloro-1-ethyl-3-(3-sulfopropyl)-2-benzimidazolinylidene]propenyl]-1-ethyl-3-(3-sulfopropyl)-,hydroxide, inner salt, sodium salt (8CI);1,1'-Diethyl-3,3'-bis(sulfopropyl)-5,5,6,6'-tetrachlorobenzimidacarbocyanine,sodium salt; 5,5',6,6'-Tetrachloro-1,1'-diethyl-3,3'-bis(g-sulfopropyl)benzimidazolocarbocyaninebetaine, sodium salt