p. 69 - 74
(2011/02/27)p. 4227 - 4230
(2007/10/03)ethyl cyclohexanecarboxylate
2-oxopiperidone-1-carbaldehyde diethyl acetal
2-oxopiperidine-1-carboxylic acid tert-butyl ester
piperidin-2-one
(5-oxo-5-cyclohexyl-pentyl)-carbamic acid tert-butyl ester