2-{(E)-3-[1,3-Diethyl-5-trifluoromethyl-1,3-dihydro-benzoimidazol-(2Z)-ylidene]-propenyl}-1,3-diethyl-5-trifluoromethyl-3H-benzoimidazol-1-ium, 2-[3-[1,3-diethyl-1,3-dihydro-5-(trifluoromethyl)-2H-benzimidazol-2-ylidene]-1-propenyl]-1,3-diethyl-5-(trifluoromethyl)-1H-benzimidazolium,
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