1-氧代-2-噁-8-氮杂螺[4.5]癸烷-8-羧酸叔丁酯

4-(2-乙氧基-2-氧代乙基)-1,4-哌啶二羧酸1-(1,1-二甲基乙基)4-乙酯

8-t-butoxycarbonyl-3-hydroxy-2-oxa-8-azaspiro[4.5]decane

N-Boc-4-哌啶甲酸乙酯

1-Boc-4-烯丙基-4-哌啶甲酸乙酯