You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-1-(2-chlorophenyl)-4-[1-[(2-methylphenyl)methyl]benzimidazol-2-yl]pyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H22ClN3O
assistant