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-[2-[5-[(5-cyanopyridine-3-carbonyl)amino]pyridin-2-yl]propan-2-yl]pyridine-3-carboxamide .
user
C21H17ClN6O2
assistant