Tert-butyl (4-(methylamino)-5-nitropyridin-2-yl)carbamate
Tert-butyl (4-chloro-5-nitropyridin-2-yl)carbamate
Tert-butyl (6-amino-1-methyl-1H-imidazo[4,5-c]pyridin-4-yl)(methyl)carbamate
Tert-butyl (6-chloro-1-methyl-1H-imidazo[4,5-c]pyridin-4-yl)(methyl)carbamate