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 2-[1-[3-(dimethylamino)propyl]-2,6-dioxopiperidin-3-yl]isoindole-1,3-dione is given. What is its corresponding molecular formula?
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C18H21N3O4
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