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(2R,3S,5R)-2-{[(hydroxy{[(2R,3S,5S)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl]oxy}phosphoryl)oxy]methyl}-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2 related products: