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Name the molecular formula for the molecule established as ethyl 4-[3-[(3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-2,6-dioxopyrimidin-1-yl]butanoate using the IUPAC nomenclature.
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C18H26N2O8
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