You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-(3,4-dimethylphenyl)-4-[1-[2-(3-methoxyphenoxy)ethyl]benzimidazol-2-yl]pyrrolidin-2-one is given. What is its corresponding molecular formula?
user
C28H29N3O3
assistant