Tert-butyl 4-(n-methyl-n-(5-nitropyridin-2-yl)amino)piperidine-1-carboxylate
Tert-butyl 4-((pyridin-4-yl)methyl)piperidine-1-carboxylate
Tert-butyl 2-(pyridin-4-yloxy)ethylcarbamate
Tert-butyl 2-(isopropoxycarbonyl)-5-bromopyridin-3-ylmethylcarbamate