1-叔丁氧羰基-4-哌啶乙酸

1-Boc-4-(4-甲氧基-4-氧基-2-丁稀)哌啶

4-哌啶乙酸

tert-butyl 4-(4-methoxy-4-oxobut-2-en-1-ylidene)piperidine-1-carboxylate

二碳酸二叔丁酯