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1-(1-Boc-4-piperidyl)-1H-imidazo[4,5-b]pyridin-2(3H)-one tert-butyl 4-(2-oxo-3H-imidazo[4,5-b]pyridin-1-yl)piperidine-1-carboxylate tert-Butyl 4-{2-oxo-1H,2H,3H-imidazo[4,5-b]pyridin-1-yl}piperidine-1-carboxylate tert-Butyl 4-(2-oxo-2,3-dihydro-1H-imidazo[4,5-b]pyridin-1-yl)piperidine-1-carboxylate 4-(2,3-Dihydro-2-oxo-1H-imidazo[4,5-b]pyridin-1-yl)-1-piperidinecarboxylic acid 1,1-dimethylethyl ester 1-Piperidinecarboxylic acid, 4-(2,3-dihydro-2-oxo-1H-imidazo[4,5-b]pyridin-1-yl)-, 1,1-dimethylethyl ester