You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[4-[6-chloro-2-[(2-methyl-1,2-dihydropyrimidin-5-yl)oxy]-1H-imidazo[4,5-b]pyridin-5-yl]phenyl]morpholine .
user
C21H21ClN6O2
assistant