1H-Pyrazolo[3,4-d]pyrimidine, 4-amino-1-.β.-D-ribofuranosyl-

2-(hydroxymethyl)-5-(4-methoxypyrazolo[3,4-d]pyrimidin-1-yl)oxolane-3,4-diol

[3,4-diacetyloxy-5-(4-anilinopyrazolo[3,4-d]pyrimidin-1-yl)oxolan-2-yl]methyl acetate

2-(4-anilinopyrazolo[3,4-d]pyrimidin-1-yl)-5-(hydroxymethyl)oxolane-3,4-diol

2-[4-(benzylamino)pyrazolo[3,4-d]pyrimidin-1-yl]-5-(hydroxymethyl)oxolane-3,4-diol