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system
Name the molecular formula for the molecule established as 3-O-(2-ethoxyethyl) 5-O-methyl 4-(2,1,3-benzoxadiazol-4-yl)-2-formyl-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate using the IUPAC nomenclature.
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C20H21N3O7
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