You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 5-[[5-fluoro-4-[3-(1,3-oxazol-5-yl)anilino]pyrimidin-2-yl]amino]-2-methylbenzenesulfonamide ?
user
C20H17FN6O3S
assistant