You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[4-[9-(9,9-diphenylfluoren-4-yl)carbazol-2-yl]phenyl]phenyl]-3-phenyl-N-(3-phenylphenyl)aniline is the IUPAC name of a molecule. Please give its molecular formula.
user
C73H50N2
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