You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-benzo[b]oxanthren-3-yl-9-[4-(9-phenylcarbazol-3-yl)quinazolin-2-yl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C54H32N4O2
assistant