You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4R)-4-[1-(2-bromoprop-2-enyl)benzimidazol-2-yl]-1-[(4-methoxyphenyl)methyl]pyrrolidin-2-one .
user
C22H22BrN3O2
assistant