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 1-[(4-chlorophenyl)methyl]-4-[(3,4-dimethoxyphenyl)methyl]piperazine-1,4-diium is given. What is its corresponding molecular formula?
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C20H27ClN2O2+2
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