You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[7-[9,9-dimethyl-7-(9-naphthalen-2-ylcarbazol-3-yl)fluoren-2-yl]-9,9-dimethylfluoren-2-yl]phenyl]-9-phenylcarbazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C76H54N2
assistant