You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[6-[benzoyl(methyl)amino]-3-[3-(2-oxopyrrolidin-1-yl)propyl]-1H-benzimidazol-3-ium-2-yl]-1-benzofuran-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H30N5O4+
assistant