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 7-[pyridin-1-ium-4-yl-(pyridin-1-ium-2-ylamino)methyl]quinolin-1-ium-8-ol is given. What is its corresponding molecular formula?
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C20H19N4O+3
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