You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-2-(2-methoxyethylamino)-1-[1-(3-methylbutanoyl)piperidin-4-yl]-2-oxoethyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H33N3O4
assistant