You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(2,4-dioxothiolan-3-yl)piperidin-2-yl]-6-fluoro-2-methylquinoline-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20FN3O3S
assistant