You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-bromo-2-ethyl-3-oxo-N-[[4-(trifluoromethoxy)phenyl]methyl]-4H-1,4-benzoxazine-7-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16BrF3N2O5S
assistant