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[(2R,3R,4S,5R)-2-(6-aminopurin-9-yl)-5-[[[(2R,3R,4S,5R)-2-(6-aminopurin-9-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-3-yl]oxy-hydroxy-phosphoryl]oxymethyl]-4-hydroxy-tetrahydrofuran-3-yl] [(2R,3R, related products: