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 N-[5-chloro-4-[6-(oxan-4-ylmethylamino)pyridin-2-yl]pyridin-2-yl]pyrrolidine-3-carboxamide .
user
C21H26ClN5O2
assistant