You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(4S)-4-phenyl-3,4-dihydro-1H-isoquinolin-2-yl]-3-pyridin-2-ylpropan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H22N2O
assistant