Synonym(s): Oxypurinol, 1H-Pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione Formula: C5H4N4O2 Formula weight: 152.11 Purity: 98+% CAS Number: 2465-59-0 Harmonized Tariff Code:  2933.59 Risk Phrases: 22-36/37/38 Harmful if swallowed. Irritating to eyes, respiratory system and skin. …