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-O-benzyl 1-O-tert-butyl (2R,5S)-2-ethyl-5-methylpiperazine-1,4-dicarboxylate is given. What is its corresponding molecular formula?
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C20H30N2O4
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