You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named methyl (2S)-1-[3-bromo-7-[(1-methoxypyridin-1-ium-3-yl)methylamino]pyrazolo[1,5-a]pyrimidin-5-yl]pyrrolidine-2-carboxylate by IUPAC nomenclature, provide its molecular formula.
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