You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[3-carbazol-9-yl-5-[3-[3-[4-(4-carbazol-9-ylphenyl)-6-phenylpyridin-2-yl]phenyl]phenyl]phenyl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C71H46N4
assistant