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 N-ethyl-2-[(2-methylphenyl)methyl-[2-(2,4,5-trichloro-N-methylsulfonylanilino)acetyl]amino]butanamide is given. What is its corresponding molecular formula?
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C23H28Cl3N3O4S
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