You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-methoxy-N-[2-[2-oxo-5-(trifluoromethyl)pyridin-1-yl]acetyl]anilino)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18F3N3O4
assistant