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 2-[[(4S)-5-cyano-4-(4-ethoxyphenyl)-2-oxo-3,4-dihydro-1H-pyridin-6-yl]sulfanyl]acetate is given. What is its corresponding molecular formula?
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C17H18N2O4S
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