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 3-[(6-chloro-4-methylpyridin-3-yl)methylsulfanylmethyl]pyridine-2-carboxylate is given. What is its corresponding molecular formula?
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C15H15ClN2O2S
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