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-(2,5-dimethyl-N-methylsulfonylanilino)-N-[(1S)-1-(2,5-dimethylphenyl)ethyl]acetamide is given. What is its corresponding molecular formula?
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C21H28N2O3S
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