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 (2R)-2-(3-chloro-4-methoxy-N-methylsulfonylanilino)-N-[2-[(2,4-dichlorophenyl)methylsulfanyl]ethyl]propanamide is given. What is its corresponding molecular formula?
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C20H23Cl3N2O4S2
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