You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[4-[9,9-dimethyl-4-phenyl-7-(4-pyridin-2-ylphenyl)fluoren-2-yl]phenyl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C50H36N2
assistant