You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,4-dichlorophenyl)-2-(7-methoxy-3-oxo-4H-1,4-benzothiazin-2-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H14Cl2N2O3S
assistant