You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-N-[[(3R)-1-[[4-(2-hydroxyethoxy)phenyl]methyl]piperidin-3-yl]methyl]benzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27ClN2O4S
assistant