You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-(9H-carbazol-2-yl)-7-(9,9-dimethyl-3,4-dihydrofluoren-2-yl)benzo[c]carbazole;5-(9H-carbazol-2-yl)-7-naphthalen-2-ylbenzo[c]carbazole;5-(9H-carbazol-2-yl)-7-(4-phenylphenyl)benzo[c]carbazole by IUPAC nomenclature, provide its molecular formula.
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C121H82N6
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