8-ethyl-3,7-dihydropurine-2,6-dione

径尿酸

7,9-二氢-3,9-二甲基-1H-嘌呤-2,6,8(3H)-三酮

4,5-dimethoxy-4,5-dihydrouric acid

8-methoxy-1,3,7-trimethylpurine-2,6-dione