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What is the molecular formula of the molecule 3-[2-[7-[9,9-dimethyl-7-[2-(9-naphthalen-2-ylcarbazol-3-yl)ethenyl]fluoren-2-yl]-9,9-dimethylfluoren-2-yl]ethenyl]-9-naphthalen-2-ylcarbazole ?
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C78H56N2
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