You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[2-[1-(1-benzofuran-2-yl)ethyl-methylamino]-2-oxoethyl]piperazin-1-yl]-N-(2-methoxyethyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H32N4O4
assistant