6-[(4-methylphenyl)methylideneamino]-1H-pyrimidine-2,4-dione

6-(4-nitroanilino)-1H-pyrimidine-2,4-dione

1,3,6,8-tetrahydro-2,4,5,7-pyrimido<5,4-g>pteridinetetrone

4-氨基-2,6-二氯嘧啶-5-甲醛