You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 1-[3-(2,3-dihydro-1-benzofuran-5-ylmethyl)-2-methylbenzimidazol-3-ium-1-yl]hexan-2-one is given. What is its corresponding molecular formula?
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C23H27N2O2+
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