You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-cyclopropyl-N-[2-[3-(2,5-dioxopyrrolidin-1-yl)propylamino]-2-oxoethyl]-3-oxo-1H-isoindole-1-carboxamide is given. What is its corresponding molecular formula?
user
C21H24N4O5
assistant