6-[(2-Methylpropan-2-yl)oxy-oxomethyl]-6-azaspiro[2.5]octane-2-carboxylic acid

spiro[3h-indole-3,4'-piperidine]-1'-carboxylic acid, 1,2-dihydro-, phenylmethyl ester ; 1'-n-cbz-1,2-dihydro-1'h-spiro[indole-3,4'-piperidine] ; 1'-(benzyloxycarbonyl)spiro(indoline-3,4'-piperidine) ; benzyl 1,2-dihydrospiro[indole-3,4'-piperidine]-1'-carboxylate ; 6-aza-spiro[2.5]octane-1,6-dicarboxylic acid 6-tert-butyl ester ; benzyl spiro[indoline-3,4'-piperidine]-1'-carboxylate ; 1,2-dihydrospiro[3h-indole-3,4'-piperidine]-1'-carboxylic acid phenylmethyl ester ; 1'-cbz-spiro[indoline-3,4'-piperidine] ; benzyl 1,2-dihydro-1'h-spiro[indole-3,4'-piperidine]-1'-carboxylate