You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3aS,6aR)-1-(oxolan-3-ylmethyl)-4-pyridin-3-yl-3,3a,6,6a-tetrahydro-2H-pyrrolo[3,2-b]pyrrol-5-one by IUPAC nomenclature, provide its molecular formula.
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C16H21N3O2
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