You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(5-chloro-2,4-dimethoxyanilino)-2-oxoethyl]-ethylamino]-N-[2-(trifluoromethyl)phenyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23ClF3N3O4
assistant