You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-(1H-benzimidazol-2-yl)-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]-4-bromo-2,5-dimethylfuran-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H20BrN3O2S
assistant