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-(4,4-difluorocyclohexyl)-5-(8-fluoro-2-methylimidazo[1,2-a]pyridin-6-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-amine .
user
C20H19F3N6
assistant