You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[1-(2-chloro-6-fluorophenyl)-4-(2-methylsulfanylanilino)-2H-pyrimidin-2-yl]amino]phenol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H20ClFN4OS
assistant