You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[N-[3-[4-(dimethylamino)phenyl]propyl]-N'-methylcarbamimidoyl]piperidin-3-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H33N5O
assistant