tert-Butyl 2'-(tert-butyl)-7'-oxo-6',7'-dihydro-2'H-spiro[piperidine-4,5'-pyrano[3,2-c]pyrazole]-1-carboxylate

6-Fluorospiro[4H-3,1-benzoxazine-4,4'-piperidin]-2(1H)-one

1'H-Spiro[piperidine-4,2'-quinazolin]-4'(3'H)-one

tert-Butyl 2-oxo-1-oxa-3,9-diazaspiro[5.5]undecane-9-carboxylate

tert-Butyl 1H-spiro[isoquinoline-4,4'-piperidine]-2(3H)-carboxylate

2-Azaspiro[5.5]undecane

3,9-Diazaspiro[5.5]undecan-2-one 2,2,2-trifluoroacetate

6'-Chloro-1'H-spiro[piperidine-4,2'-quinazolin]-4'(3'H)-one hydrochloride

3-Oxaspiro[5.5]undecan-8-one

3-(2-Chloropropanoyl)spiro[benzo[e][1,3]oxazine-2,1'-cyclohexan]-4(3H)-one