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Phosphoric acid (2R,3S,4R,5R)-5-(2-amino-6-oxo-1,6-dihydro-purin-9-yl)-3,4-dihydroxy-tetrahydro-furan-2-ylmethyl ester (2R,3R,4R,5R)-2-(4-amino-2-oxo-2H-pyrimidin-1-yl)-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-3-yl ester