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 methyl 1-[2-[2-(4-methoxyphenyl)-8-methylindolizin-3-yl]-2-oxoethyl]pyridin-1-ium-3-carboxylate is given. What is its corresponding molecular formula?
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C25H23N2O4+
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