1H-Pyrazolo[3,4-d]pyrimidin-4,6-diol 1H-Pyrazolo[3,4-d]pyrimidine, 4,6(5H,7H)-dione 1H-Pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione 1H-Pyrazolo[3,4-d]pyrimidine-4,6-diol 2465-59-0 4,6-Dihydroxypyrazolo[3,4-d]pyrimidine Alloxanthin Alloxanthine B. W. 55-5 BW 555 DHPP NSC76239 Oxipurinol Oxoallopurinol Oxypurinol