1-(1-(叔丁氧基羰基)哌啶-4-基)-4-乙基哌啶-4-羧酸

tert-butyl 2-tert-butyl-7-oxospiro[6H-pyrano[3,2-c]pyrazole-5,4'-piperidine]-1'-carboxylate

3-甲氧基-4-氧代哌啶-1-羧酸叔丁酯

4-(4-氟苯基)-1,2,3,6-四氢吡啶

4-(3-乙氧基-3-氧代-1-丙炔-1-基)-4-羟基-1-哌啶羧酸 1,1-二甲基乙酯