You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-(4-dibenzofuran-3-yl-6-phenyl-1,3,5-triazin-2-yl)-1-[3-[3-(9,9-dimethylfluoren-3-yl)phenyl]phenyl]-3-phenylcarbazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C66H44N4O
assistant