You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[4-[(2,5-dioxopyrrolidin-1-yl)methyl]phenyl]-3-(5-methyl-1,3-dioxoisoindol-2-yl)propanamide is given. What is its corresponding molecular formula?
user
C23H21N3O5
assistant