You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-[3-[methyl(quinolin-6-ylmethyl)amino]-3-oxopropyl]-5-oxopyrrolidin-2-yl]propanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25N3O4
assistant