4-Amino-6-hydroxypyrazolo[3,4-d]pyrimidine5472-41-3100 % similar 4-Amino-1,7-dihydro-6H-pyrazolo[3,4-d]pyrimidine-6-thione23771-52-059 % similar 1H-Pyrazolo[3,4-d]pyrimidin-4-amine2380-63-450 % similar 4-Hydroxy-6-mercaptopyrazolo(3,4-d)pyrimidine24521-76-442 % similar Oxipurinol2465-59-042 % similar Melamine cyanurate37640-57-633 % similar