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(2R,3S,4R,5R)-2-({[{[(2R,3S,4R,5R)-5-(2-amino-6-oxo-3,6-dihydro-9H-purin-9-yl)-4-hydroxy-2-(hydroxymethyl)tetrahydrofuran-3-yl]oxy}(hydroxy)phosphoryl]oxy}methyl)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2 related products: