You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-N-[4-(furan-2-carbonylamino)-2-(trifluoromethyl)phenyl]-5-oxopyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18F3N3O4
assistant