3-Methyl-1,3-oxazolidine-2,4-dione

羟基乙酸

1,3-二甲基-1,3-二嗪农-2,4,5,6-四酮

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

9-丁基-1,3-二甲基-8-巯基-7H-嘌呤-2,6-二酮