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-O-methyl 4-O-[[(2R,5R)-5-methyl-6-methylidene-3-oxopiperazin-2-yl]methyl] (E)-but-2-enedioate is given. What is its corresponding molecular formula?
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C12H16N2O5
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