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(1989)Acetic acid (2R,3R,4R,5R)-4-acetoxy-5-acetoxymethyl-2-(2-acetylamino-6-oxo-1,6-dihydro-purin-9-yl)-tetrahydro-furan-3-yl ester
2',3',5'.-tri-O-acetyl-8-bromoguanosine
2-acetamido-6-ethoxy-8-methanesulfonyl-9-(3,5-di-O-acetyl-2-O-tosyl-1-β-D-ribofuranosyl)-9H-purine
Acetic acid (2R,3R,4R,5R)-2-acetoxymethyl-5-(2-acetylamino-6-ethoxy-8-methylsulfanyl-purin-9-yl)-4-(toluene-4-sulfonyloxy)-tetrahydro-furan-3-yl ester
2-acetamido-6-ethoxy-8,2'-diethoxycarbonylmethano-9-(3,5-di-O-acetyl-2-deoxy-β-D-arabinofuranosyl)-9H-purine