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Under IUPAC nomenclature, a molecule named (4aR,7aS)-1-[4-ethyl-5-[5-(hydroxymethyl)furan-2-yl]-1,2,4-triazol-3-yl]-3,4,4a,6,7,7a-hexahydro-2H-pyrrolo[3,4-b]pyridin-5-one is given. What is its corresponding molecular formula?
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C16H21N5O3
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