You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[(4-chlorophenyl)methyl]piperidin-4-yl]-2-(3-oxo-4H-1,4-benzothiazin-2-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H24ClN3O2S
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