ethyl 1-benzyl-3-ethyl-4-oxopiperidine-3-carboxylate

4-(2-benzhydryloxyethyl)-1-benzylpiperidine

2-(1-benzylpiperidin-4-yl)acetaldehyde

1-(4-哌啶基)-3-吡咯烷醇

4-苯基-3,6-二氢-2H-吡啶-1-羧酸叔丁酯