You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(diethylamino)-2-oxoethyl]-methylamino]-N-[[4-(difluoromethoxy)-3-methoxyphenyl]methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27F2N3O4
assistant