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 5-chloro-4-[2-[(5-chloro-2H-indazol-3-yl)methylamino]ethyl]-N-(2,2-difluoro-2-pyridin-2-ylethyl)pyrimidin-2-amine ?
user
C21H19Cl2F2N7
assistant