You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1-acetylpiperidin-4-yl)-N-[1-(4-aminobutan-2-yl)piperidin-4-yl]-N-(thiophen-3-ylmethyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H38N4O2S
assistant