You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 8-chloro-2-[(4,6-dimethyl-2-oxo-1H-pyridin-3-yl)methyl]-5-fluoro-7-[(3R)-oxolan-3-yl]oxy-3,4-dihydroisoquinolin-1-one into molecular formula.
user
C21H22ClFN2O4
assistant