N-BOC-苄基-2,7-二氮杂螺环[3.5]正壬烷

1-叔丁氧羰基-4-哌啶甲酰胺

1-吡啶-4-哌啶-4-甲酸

4-[4-(乙氧基羰基)哌啶]苯甲酸

ethyl 1-(4-nitrophenyl)piperidine-4-carboxylate