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 [4-(2-ethoxyphenyl)piperazin-1-yl]-[1-[(3-methoxyphenyl)methyl]piperidin-4-yl]methanone;oxalic acid is given. What is its corresponding molecular formula?
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C28H37N3O7
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