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-[[1-ethyl-6-methyl-4-(oxan-4-ylamino)pyrazolo[3,4-b]pyridin-5-yl]methyl]-3-fluoropyridine-4-carboxamide .
user
C21H25FN6O2
assistant