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4-(5-Nitro-pyridin-2-yloxy)-piperidine-1-carboxylic acid tert-butyl ester 1-Piperazinecarboxylic acid, 4-(2-aMino-3-pyridinyl)-, 1,1-diMethylethyl ester tert-Butyl 4-((6-bromopyridin-3-yl)methyl)piperazine-1-carboxylate tert-Butyl 4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate tert-Butyl 4-[(5-aminopyridin-2-yl)oxy]piperidine-1-carboxylate