You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (3R,8aR)-2-[(2,2-difluoro-1,3-benzodioxol-5-yl)methyl]-3-methyl-1,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazin-4-one into molecular formula.
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C16H18F2N2O3
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