You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[[5-methyl-6-(3-methyl-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)pyridin-3-yl]methyl]ethanamine by IUPAC nomenclature, provide its molecular formula.
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C17H28N4
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