5-amino-1,3-dimethyl-1,3-diazinane-2,4,6-trione

5-hydroxy-1,3-dimethylimidazolidine-2,4-dione

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

5-(1-甲基-1H-苯并咪唑-2-基)-2-糠醛

1,3,7,9-tetramethyl-8H-purin-1-ium-2,6-dione,iodide