2-(4-cyanophenyl)-1-oxo-2,8-diazaspiro[4.5]decane-8-carboxylic acid 2,2,2-trichloroethyl ester

1-benzylpiperidin-4-yl acetate

1-(1-benzylpiperidin-4-yl)pyrrolidin-3-ol

1-benzyl-2',3'-dihydro-2'-oxospiro-[piperidine-4,4'(1'H)-quinazoline]

vinyl 6-chloro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,4'-piperidine]-1'-carboxylate