You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[2-[6-amino-2-fluoro-8-[(5-methyl-2,3-dihydro-1-benzofuran-6-yl)methyl]purin-9-yl]ethyl]cyclopropanecarboxamide ?
user
C21H23FN6O2
assistant