You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-1-(3,4-dihydro-1H-isoquinolin-2-yl)-3-methyl-1-oxobutan-2-yl]methanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H22N2O3S
assistant