6642-31-5
1,3-二甲基-6-氨基脲嘧啶
→
7150-04-1
6-amino-5-bromo-1,3-dimethylpyrimidine-2,4-dione
58-08-2
咖啡因
6439-85-6
1,3,7,9-tetramethylpyrimido[5,4-g]pteridine-2,4,6,8-tetrone
7464-89-3
1,3,6,8-tetramethylpyrimido[4,5-g]pteridine-2,4,7,9-tetrone