You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-chloro-N-[5-chloro-1-(2,2-difluoroethyl)pyrazol-4-yl]-7-[1-(oxetan-3-yl)piperidin-4-yl]quinazolin-2-amine .
user
C21H22Cl2F2N6O
assistant