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system
Name the molecular formula for the molecule established as N-[1-[(5-ethyl-6,7-dihydro-4H-[1,3]thiazolo[5,4-c]pyridin-2-yl)amino]-3-methyl-1-oxobutan-2-yl]-2-methylbenzamide using the IUPAC nomenclature.
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C21H28N4O2S
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