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-[(4,4-difluoropiperidin-1-ium-1-yl)methyl]-N-pyrimidin-2-ylimidazo[1,5-a]pyridine-3-carboxamide is given. What is its corresponding molecular formula?
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C18H19F2N6O+
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