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-[2-[2-(difluoromethoxy)ethylamino]-7H-pyrrolo[2,3-d]pyrimidin-5-yl]phenyl]-(4-methylpiperazin-1-yl)methanone .
user
C21H24F2N6O2
assistant