1H-Pyrazolo[3,4-d]pyrimidin-4-ol, 6-amino- 2537-04-4 4-Hydroxy-6-aminopyrazolo(3,4-d)pyrimidine 4-Hydroxy-6-aminopyrazolo[3,4-d]pyrimidine 4H-Pyrazolo[3,4-d]pyrimidin-4-one, 6-amino-1,5-dihydro- HAPP NSC760