You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-ethylphenyl)-2-[[2-[4-[2-(methylamino)ethyl]piperidin-1-yl]acetyl]amino]acetamide;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H33ClN4O2
assistant