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

5-脱氮黄素

5-(2-呋喃亚甲基)六氢嘧啶-2,4,6-三酮

5-[(4-氯苯基)亚甲基]-1,3-二嗪农-2,4,6-三酮