You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[1-(1H-benzimidazol-2-yl)-2-methylpropyl]-2-(5-piperidin-1-ylsulfonylthiophen-2-yl)acetamide into molecular formula.
user
C22H28N4O3S2
assistant