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 5-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)-2-methyl-2-(propan-2-ylamino)pentanamide into molecular formula.
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C16H32N4O
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