N-(2-aminoethyl)-6-[(2,2-diphenylethyl)amino]-9-{(2R,3R,4S,5S)-5-[(ethylamino)carbonyl]-3,4-dihydroxytetrahydro-2-furanyl}-9H-purine-2-carboxamide → benzyl 4-[({[(2-{[(6-[(2,2-diphenylethyl)amino]-9-{(2R,3R,4S,5S)-5-[(ethylamino)carbonyl]-3,4-dihydroxytetrahydro-2-furanyl}-9H-purine-2-yl)carbonyl]amino}ethyl)amino]carbonyl}amino)methyl]benzoate

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Prepared from N-(2-aminoethyl)-6-[(2,2-diphenylethyl)amino]-9-{(2R,3R,4S,5S)-5-[(ethylamino)carbonyl]-3,4-dihydroxytetrahydro-2-furanyl}-9H-purin-2-carboxamide (Preparation 10) and benzyl 4-{[(1H-imidazol-1 ylcarbonyl)amino]methyl}benzoate (Preparation 54) by a similar method to Example 1. The target compound was obtained as a white solid.

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