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system
Name the molecular formula for the molecule established as methyl (3R,4S)-4-(3-bromophenyl)-5-cyano-6-[2-(4-methylanilino)-2-oxoethyl]sulfanyl-2-oxo-3,4-dihydro-1H-pyridine-3-carboxylate using the IUPAC nomenclature.
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C23H20BrN3O4S
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