N-(2-苯乙基)-4-哌啶酮

8-溴-2,3,4,5-四氢-1H-吡啶并[4,3-b]吲哚

4-苯基-4-羟基哌啶

1-苄基-4-(4-氯苯基)-4-哌啶醇

N-乙酰基-4-哌啶酮