You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-(3,4-dihydro-1H-isoquinolin-2-yl)-1-oxopropan-2-yl] 4-(methoxymethyl)benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23NO4
assistant