二氯乙酰基脲

5-[(4-hydroxy-3-methoxyphenyl)methylidene]-1,3-diazinane-2,4,6-trione

7,9-diazaspiro[4.5]decane-6,8,10-trione

5-(1-benzothiophen-3-ylmethylidene)-1,3-diazinane-2,4,6-trione