1,3-二甲基-8-丙-2-烯基-7H-嘌呤-2,6-二酮

1,3,9-三甲基尿酸

3,5,7-trimethyl-[1,2]oxazolo[3,4-d]pyrimidine-4,6-dione

5,7-dimethyl-3-phenyl-[1,2]oxazolo[3,4-d]pyrimidine-4,6-dione

3,5,7,7-tetramethyl-3,5-diazabicyclo[4.2.0]octane-2,4-dione