Synonyms: 1H-Pyrazolo[3,4-d]pyrimidin-6-ol,4-amino- (6CI,8CI); 1H-Pyrazolo[3,4-d]pyrimidine, 4-amino-, 6-oxide (7CI);6H-Pyrazolo[3,4-d]pyrimidin-6-one, 4-amino-1,5-dihydro- (9CI);4-Amino-6-hydroxypyrazolo[3,4-d]pyrimidine;4-Amino-6-oxopyrazolo[3,4-d]pyrimidine; NSC 28415