You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (3aS,7aS)-2-[4-(azocan-1-yl)-3-nitrophenyl]-3a,4,5,6,7,7a-hexahydroisoindole-1,3-dione is given. What is its corresponding molecular formula?
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C21H27N3O4
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