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 3-[5-chloro-2-[(1R)-1-[(2,6-diamino-5-isocyanopyrimidin-4-yl)amino]ethyl]-4-oxoquinazolin-3-yl]benzamide .
user
C22H18ClN9O2
assistant