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)-1-[4-(3,5-dimethoxybenzoyl)piperazin-1-yl]-2-methylpropan-1-one is given. What is its corresponding molecular formula?
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C23H26Cl2N2O4
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