You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2-bromophenyl)-5-oxo-N-[4-(pyridin-4-ylmethyl)phenyl]pyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H20BrN3O2
assistant