You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[3-(4a,9a-dihydrocarbazol-9-yl)-5-[4-(2-tert-butyl-4-methylpentyl)phenyl]phenyl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C46H46N2
assistant