You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[(2S)-1-methylpyrrolidin-2-yl]-1-[8-[3-[(2S)-1-methylpyrrolidin-2-yl]pyridin-1-ium-1-yl]octyl]pyridin-1-ium;diiodide by IUPAC nomenclature, provide its molecular formula.
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C28H44I2N4
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