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 2,6-dichloro-N-[[2-(dimethylamino)pyridin-3-yl]methyl]-3-(2-methoxyethylsulfonyl)benzamide is given. What is its corresponding molecular formula?
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C18H21Cl2N3O4S
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