4-[(甲基磺酰基)氧基]哌啶-1-羧酸苄酯

1-Boc-4-甲氧基哌啶

4-(甲基硫代)哌啶-1-羧酸叔丁酯

4-羟基哌啶-1-羧酸烯丙酯

4-羟基-1-哌啶乙醇