You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-methoxyphenyl)-N-[3-(1,2-oxazol-4-yl)propyl]-5-oxopyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H21N3O4
assistant