You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-methoxy-N-(2-methoxyethyl)-N-[2-oxo-2-[2-(trifluoromethyl)anilino]ethyl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21F3N2O4
assistant