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-[(3,4-dichlorophenyl)methylsulfanyl]-1-[4-(4-methoxyphenyl)piperazin-1-yl]ethanone is given. What is its corresponding molecular formula?
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C20H22Cl2N2O2S
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