You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9,9-dimethyl-7-phenyl-N-[3-(9-phenylfluoren-9-yl)phenyl]-N-(2-phenylphenyl)fluoren-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C58H43N
assistant