8-氯-3,7-二氢-1,3,7-三甲基-1H-嘌呤-2,6-二酮

氯化氰

1-甲基咪唑烷-2,4,5-三酮

3-Hydroxy-5,7-dimethyloxazolo<5,4-d>pyrimidine-2,4,6(3H,5H,7H)-trione

4,6,8-Trimethyl-1,2,4-dioxazino<6,5-d>pyrimidine-3,5,7(4H,6H,8H)-trione