You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopropyl-1-[1-[(5-methoxy-4-oxo-1H-pyridin-2-yl)methyl]piperidin-4-yl]piperidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32N4O3
assistant