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9-{[3-(9H-CARBAZOL-9-YLMETHYLENE)-2,4-DIPHENYLCYCLOBUTYLIDENE]METHYL}-9H-CARBAZOLE 9-{[3-(9H-CARBAZOL-9-YLMETHYLENE)-2,4-DIPHENYLCYCLOBUTYLIDENE]METHYL}-9H-CARBAZOLE