You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-(1,1-difluoropropan-2-yl)-2-[5-fluoro-2-[[5-fluoro-7-[(1-oxothietan-1-ylidene)amino]quinazolin-4-yl]amino]phenoxy]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23F4N5O3S
assistant