You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-[2-[(3-chlorophenyl)methylidene]-3-oxo-1,4-benzothiazin-4-yl]-N-(2-methoxyethyl)acetamide using the IUPAC nomenclature.
user
C20H19ClN2O3S
assistant