You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 6-[2-(5,8-difluoro-3,4-dihydro-1H-isoquinolin-2-yl)-2-oxoethoxy]-3,4-dihydro-1H-quinolin-2-one .
user
C20H18F2N2O3
assistant