You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[2-(4-fluoroanilino)-6-methylpyrimidin-4-yl]piperazin-1-yl]-(furan-2-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20FN5O2
assistant