You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3,4-dihydrocarbazol-9-yl)-9-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]carbazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C45H31N5
assistant