benzyl 4-((1E)-3-ethoxy-3-oxoprop-1-en-1-yl)piperidine-1-carboxylate

4-(3-乙氧基-3-氧代丙基)哌啶-1-羧酸叔丁酯

ethyl 3-pyridin-4-ylprop-2-enoate

4-吡啶甲醛

N-Boc-4-哌啶甲醇