You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl (3R,4S)-5-cyano-6-[2-(2-ethyl-6-methylanilino)-2-oxoethyl]sulfanyl-2-oxo-4-phenyl-3,4-dihydro-1H-pyridine-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C25H25N3O4S
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