4-苯基-4-哌啶甲酸

4-phenyl-1-phenylmethoxycarbonylpiperidine-4-carboxylic acid

4-苯甲酰基-4-苯基-1-(对甲苯基磺酰基)哌啶

4-亚苄基-哌啶-1-羧酸叔丁酯

1-苯甲酰基-4-苯甲酰基哌啶