2-(4-hydrazino-6-thioxo-6,7-dihydro-1H-pyrazolo[3,4-d]pyrimidin-3-yl)acetonitrile

2-[6-(benzylsulfanyl)-4-(benzothiazol-2-yl-amino)-1H-pyrazolo[3,4-d]pyrimidin-3-yl]acetonitrile

2-{4-[2-(2-thienylmethylene)hydrazino]-6-thioxo-6,7-dihydro-1H-pyrazolo[3,4-d]pyrimidin-3-yl}acetonitrile

3-(2-thienyl)-2-{4-[2-(2-thienylmethylene)hydrazino]-6-thioxo-6,7-dihydro-1H-pyrazolo[3,4-d]pyrimidin-3-yl}acetonitrile

2-{4-[4-(2-(4-chlorophenyl)hydrazono)-3-methyl-5-oxo-4,5-dihydropyrazol-1-yl]-6-thioxo-6,7-dihydro-1H-pyrazolo[3,4-d]pyrimidin-3-yl}acetonitrile