1-苄基-4-哌啶甲酸甲酯

methyl 1-acetylpiperidine-4-carboxylate

N-甲基-4-哌啶甲酸甲酯

1-(4-硝基苯基)-4-哌啶羧酸甲酯

1-(氯羰基)哌啶-4-羧酸甲酯