Pyrimido[5,4-d]pyrimidine-2,4,6,8-tetrol(6CI,8CI);Pyrimido[5,4-d]pyrimidine-2,4,6,8(3H,7H)-tetrone,1,5-dihydro-;Homouric acid;NSC20089;NSC 338188;Pyrimido[5,4-d]pyrimidine-2,4,6,8(1H,3H,5H,7H)-tetrone;
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