ethyl 1-pyridin-2-ylpiperidine-4-carboxylate

ethyl 1-propan-2-ylpiperidine-4-carboxylate

1-(2-溴乙酰基)-4-哌啶羧酸乙酯

N-Boc-4-哌啶甲酸乙酯

1-((吡啶-4-基)甲基)哌啶-4-甲酸乙酯