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system
Name the molecular formula for the molecule established as 3-[[5-(2-ethyl-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-2,3-dihydropyridin-2-yl]oxy]-2,2-dimethylpropanoic acid using the IUPAC nomenclature.
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C20H26N2O4
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