You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-4-[1-[(4-bromophenyl)methyl]benzimidazol-2-yl]-1-tert-butylpyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H24BrN3O
assistant