You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-amino-6-[2-(3-methoxyphenyl)-2-oxoethyl]sulfanyl-4-(4-methylphenyl)pyridine-3,5-dicarbonitrile by IUPAC nomenclature, provide its molecular formula.
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C23H18N4O2S
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