6-苯甲基-5,6,7,8-四氢-1H-哌啶并[4,3-D]2,4-二嘧啶酮

ethyl 1-benzyl-3-ethyl-4-oxopiperidine-3-carboxylate

1-苄基-3-(羟基甲基)哌啶-4-醇

1-苄基-4-羟基哌啶-3-羧酸甲酯