You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[2-(4-chlorophenoxy)ethyl]-3-oxo-1,4-benzoxazin-6-yl]-3-fluorobenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18ClFN2O4
assistant