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system
Translate the chemical IUPAC name ethyl (1S,2S,4R)-2-ethyl-7-[3-(1,2,4-triazol-4-yl)-1H-1,2,4-triazole-5-carbonyl]-7-azabicyclo[2.2.1]heptane-2-carboxylate into its molecular formula.
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C16H21N7O3
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