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system
Name the molecular formula for the molecule established as [2-(5-chloro-2-methylanilino)-2-oxoethyl] (3S,7aR)-7a-methyl-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-3-carboxylate using the IUPAC nomenclature.
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C17H19ClN2O4S
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