You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,1,3-benzoxadiazol-5-ylmethyl)-N-methyl-2-[(2R)-3-oxo-1-(pyridin-2-ylmethyl)piperazin-2-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22N6O3
assistant