You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-(4-chlorophenyl)sulfonylpiperidin-4-yl]-N-[(2,4-dimethoxyphenyl)methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H27ClN2O5S
assistant