You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[(3-methoxypyridin-2-yl)methylsulfinyl]-3H-benzimidazol-5-yl]propan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H17N3O3S
assistant