7-氨基-1,3-二甲基-1h,8h-吡啶并[2,3-d]嘧啶-2,4,5-三酮

6-氨基-1,3-二甲基吡啶并[2,3-d]嘧啶-2,4(1h,3h)-二酮

2-苄基丙二腈

2-amino-6,8-dimethyl-5,7-dioxo-4-phenylpyrido<2,3-d>pyrimidine-3-nitrile

5-amino-1,3-dimethylpyrimido[4,5-d]pyrimidine-2,4-dione