N,N'-bis-(2-nitro-benzenesulfonyl)-guanidine

4-(4-甲氧基苯基)6-苯基-2-氨基嘧啶

2-氨基-5H-[1]苯并吡喃并[4,3-d]嘧啶-5-醇

2-amino-9-chloro-5H-chromeno[4,3-d]pyrimidin-5-ol

2,4-Diamino-6-hydroxy-5-isonitroso-pyrimidin