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2,4-BIS(1-ETHYL-2(1H)-QUINOLYLIDENEMETHYL)-1,3-CYCLOBUTADIENEDIYLIUM-1,3-DIOLATE 2,4-BIS(1-ETHYL-2(1H)-QUINOLYLIDENEMETHYL)-1,3-CYCLOBUTADIENEDIYLIUM-1,3-DIOLATE