You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[9-(9-phenylcarbazol-3-yl)-9-(9-phenyl-9,10-dihydrophenanthren-3-yl)fluoren-2-yl]-(4-phenylphenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C64H43NO
assistant