5-Chloro-1H-pyrazolo[4,3-d]pyrimidine
1H-Pyrazolo[4,3-d]pyrimidin-7-amine
3-Bromo-5-chloro-1H-pyrazolo[4,3-d]pyrimidine
5-Chloro-3-iodo-1H-pyrazolo[4,3-d]pyrimidine
3-Bromo-5,7-dichloro-1H-pyrazolo[4,3-d]pyrimidine
