1-苄基-4-(甲氨基)哌啶

2-甲基-4-哌啶酮

6-氨基-1-苄基-5-溴尿嘧啶

1-benzyl-8-methoxypyrido[2,1-f]purine-2,4(1H,3H)-dione

4-羟基吡啶