You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-(1,3,3a,4,5,6,7,7a-octahydroisoindole-2-carbonyl)-1-tert-butylpyrrolidin-2-one by IUPAC nomenclature, provide its molecular formula.
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C17H28N2O2
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