8-(环己基甲基)-1,3-二甲基-7H-嘌呤-2,6-二酮

7-氨基-1,3-二甲基-2,4(1H,3H)-蝶啶二酮

7-amino-1,3-dimethyl-5,6-dihydropteridine-2,4-dione

1,3,6,8-tetramethylpyrimido[4,5-g]pteridine-2,4,7,9-tetrone

β-(5-amino-6-imino-1,3-dimethyluracilyl)chalcone