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 5-O-(2-methoxyethyl) 3-O-propan-2-yl 2,6-dimethyl-4-(3-nitrophenyl)-1,2,3,4-tetrahydropyridine-3,5-dicarboxylate is given. What is its corresponding molecular formula?
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C21H28N2O7
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