You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7,7-dimethyl-3-N,9-N-dinaphthalen-2-yl-3-N,9-N-diphenylfluoreno[5,6-b][1]benzofuran-3,9-diamine by IUPAC nomenclature, provide its molecular formula.
user
C53H38N2O
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