You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[4-(N-(9,9-dimethylfluoren-4-yl)-3-phenylanilino)phenyl]phenyl]-1-(4-phenylphenyl)quinazoline-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C59H43N3O2
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