1-(tert-Butoxycarbonyl)-5'-methyl-4',5'-dihydrospiro[piperidine-4,7'-thieno[2,3-c]pyran]-2'-carboxylic acid
tert-Butyl 2'-chloro-4',5'-dihydrospiro[piperidine-4,7'-thieno[2,3-c]pyran]-1-carboxylate
tert-Butyl 3-oxo-2,3-dihydrospiro[indene-1,4'-piperidine]-1'-carboxylate
6-Bromo-2,4-dihydrospiro[benzo[b][1,4]dioxepine-3,1'-cyclopropane]
tert-Butyl 4',5'-dihydrospiro[piperidine-4,7'-thieno[2,3-c]pyran]-1-carboxylate
