You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-[4-[(4-propan-2-ylpiperidin-1-yl)methyl]phenyl]ethyl]methanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H30N2O2S
assistant