You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1,2,3,4,6,7,8,8a-octahydropyrrolo[1,2-a]pyrazin-6-yl(methyl)phosphane;ethane by IUPAC nomenclature, provide its molecular formula.
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C10H23N2P
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