You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[4-(3,6-diphenylcarbazol-9-yl)phenyl]-N-[4-[3-[(2E,4Z)-hepta-2,4,6-trien-2-yl]-6-phenylcarbazol-9-yl]phenyl]dibenzofuran-2-amine by IUPAC nomenclature, provide its molecular formula.
user
C73H51N3O
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