1H-Benzimidazolium, 5,6-dichloro-2-(3-(5,6-dichloro-1,3-diethyl-1,3-dihydro-2H-benzimidazol-2-ylidene)-1-propenyl)-1,3-diethyl- 21527-78-6 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolocarbocyanine JC-1