You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(7-chloro-1-methylbenzimidazol-2-yl)methyl]-1-ethylsulfonylpiperidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H23ClN4O3S
assistant