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 N-[1-(4-fluorophenyl)ethyl]-N-methyl-3-(1-methyl-4-oxopyrazolo[3,4-d]pyrimidin-5-yl)propanamide .
user
C18H20FN5O2
assistant