a class of compounds that lack a nitrogen atom in the purine ring, such as 7-deazaguanine and 7-deazahypoxanthine
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(+)-(1S,2S,3S)-2,3-bis<(benzyloxy)methyl>-1-cyclobutyl acetate
4,5-dichloro-2-(pivaloylamino)-7-[(2,3,5-tri-O-benzoyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine
