You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-(4-methoxy-2-methylphenyl)sulfonylpyrrolidin-2-yl]-(4-methylpiperidin-1-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28N2O4S
assistant