You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3-[2-(3-ethylpyrrolidin-1-yl)-7-methylquinoxalin-5-yl]-5-fluoro-1H-pyridin-2-one using the IUPAC nomenclature.
user
C20H21FN4O
assistant