甲醛

1,3-二甲基-6-氨基脲嘧啶

4-amino-1,3-dimethyl-2,6-dioxopyrimidine-5-carbothialdehyde

5-((dimethylamino)methylene)-6-imino-1,3-dimethyldihydropyrimidine-2,4(1H,3H)-dione

6-azido-1,3-dimethylpyrimidine-2,4-dione