2-[4-[(2E)-2-[[4-[bis(2-chloroethyl)amino]phenyl]methylidene]hydrazinyl]pyrazolo[3,4-d]pyrimidin-1-yl]-5-(hydroxymethyl)oxolane-3,4-diol

N'-[1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

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

7-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-2,3-dihydroimidazo<1,2-c>pyrazolo<4,3-e>pyrimidine

7-(β-D-ribofuranosyl)-2,3-dihydroimidazo<1,2-c>pyrazolo<4,3-e>pyrimidine