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tert-butyl 6-oxo-2-azaspiro[3.3]heptane-2-carboxylate Carbamic acid, N-(trans-3-aminocyclobutyl)-, 1,1-dimethylethyl ester 1-BOC-3-METHYLAMINOAZETIDINE (2S)-2-Methyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester 1-Piperidinecarboxylicacid,2-methyl-4-oxo-,1,1-dimethylethylester,(2R)-(9CI) 4-Cyano-4-(toluene-4-sulfonyloxyMethyl)-piperidine-1-carboxylic acid tert-butyl ester 4-FLUOROPIPERIDINE 1-BOC-4-FLUORO-4-PIPERIDINECARBOXYLIC ACID