胞嘧啶

5-(3,3-diethyltriaz-1-en-1-yl)pyrimidine-2,4(1H,3H)-dione

6-hydroxylamino-5,6-dihydropyrimidine

1-(4-methoxybenzoyl)pyrimidine-2,4-dione

3-(4-nitrobenzoyl)-1H-pyrimidine-2,4-dione