You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,3-dimethylphenyl)-N-[4-[(3S)-3-methylpiperidin-1-yl]-4-oxobutyl]methanesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H30N2O3S
assistant