You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(furan-2-carbonyl)piperazin-1-yl]-6-methyl-N-(oxolan-2-ylmethyl)pyrimidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25N5O4
assistant