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 2,5-dichloro-N-[2-[(2-methoxy-4,5-dimethylphenyl)sulfonylamino]ethyl]benzamide is given. What is its corresponding molecular formula?
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C18H20Cl2N2O4S
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