You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-ethyl-2-(3-fluoropyrrolidin-1-yl)-N-[3-methoxy-1-(1-methylpyrrolidin-3-yl)pyrazol-4-yl]imidazo[2,1-f][1,2,4]triazin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28FN9O
assistant