6-乙氧基-1,3-二甲基-嘧啶-2,4-二酮

1,3-二甲基-5-氰基尿嘧啶

decahydro-1,3-dimethyl-2,4-dioxo-7bH-cyclopenta[3,4]cyclobuta[1,2-d]pyrimidine-7b-carboniotrile

2-(1,2,3,4-tetrahydro-1,3-dimethyl-2,4-dioxo-5-pyrimidinyl)cyclopentanecarbonitrile