You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(azepan-1-yl)-2-oxoethyl]-N-(4-chloro-2-methylphenyl)-4-methylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27ClN2O3S
assistant