You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-N-[(2,4-difluorophenyl)methyl]-1-(2-methoxyethyl)-5-oxopyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H18F2N2O3
assistant