You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[1-(furan-2-ylmethyl)piperidine-3-carbonyl]piperazin-1-yl]-1H-pyrazin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N5O3
assistant