4-N-(3-N-methylureido)-5-phenyl-7-(5-deoxy-2,3-O-isopropylidenyl-β-D-ribofuranosyl)pyrrolo[2,3-d]pyrimidine

4-N-(carbomethoxymethyl)amino-7-(5-deoxy-2,3-O-isopropylidenyl-β-D-ribofuranosyl)-5-phenylpyrazolo[3,4-d]pyrimidine

4-N-(propoxycarbonyl)amino-5-phenyl-7-(5-deoxy-2,3-O-isopropylidenyl-β-D-ribofuranosyl)pyrrolo[2,3-d]pyrimidine

4-N-(N-(n-propyl)carbamoylmethyl)amino-5-phenyl-7-(5-deoxy-2,3-O-isopropylidenyl-β-D-ribofuranosyl)pyrrolo[2,3-d]pyrimidine

4-N-(N-cyclopropylthionocarbamoylmethyl)amino-5-phenyl-7-(5-deoxy-2,3-O-isopropylidenyl-β-D-ribofuranosyl)pyrrolo[2,3-d]pyrimidine