You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[5-(8-chloro-6-fluoro-2-morpholin-4-ylquinazolin-4-yl)-2-methoxypyridin-3-yl]-N-methylsulfonylmethanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21ClFN5O6S2
assistant