You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-cyclobutyl-3H-benzimidazol-5-yl)-4-methylsulfonylpiperidine-4-carboxamide;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H26Cl2N4O3S
assistant