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system
Provide the molecular formula for the IUPAC named substance [2-[benzyl(methyl)amino]-2-oxoethyl] (3S,7aR)-7a-methyl-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-3-carboxylate .
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C18H22N2O4S
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