4-(4-Boc-1-哌嗪)-5-溴-7H-吡咯并[2,3-d]嘧啶

4-(3-溴-苯基)-哌嗪-1-羧酸叔丁酯

1-(4-氯苯基)哌嗪

4-(5-碘-2-吡啶基)胡椒嗪-1-羧酸叔丁酯

1-(2-糠酰)哌嗪