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 2-(3-methylcyclopentyl)-3-propan-2-yl-6,7,8,8a-tetrahydro-3H-pyrrolo[1,2-a]pyrazine-1,4-dione into molecular formula.
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C16H26N2O2
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