N-(4-叔丁基苄基)哌啶-4-羧酸

1-(1-benzhydrylazetidin-3-yl)piperidine-4-carboxylic acid

1-乙酰基哌啶-4-羧酸乙酯

4-(甲氧基羰基)-1-哌啶乙酸乙酯

4-(3-氧代丁酰基)哌啶-1-羧酸叔丁酯