You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-4-[3,3-difluoro-2-hydroxy-1-[(2-methylquinolin-5-yl)amino]-2-(methylsulfanylmethyl)-3-phosphanylpropyl]phenol is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22ClF2N2O2PS
assistant