Ethyl 2-bromo-3-(difluoromethyl)-5-nitropyridine-6-carboxylate
Methyl 3-bromo-6-(difluoromethyl)-4-nitropyridine-2-carboxylate
Methyl 3-bromo-6-(difluoromethyl)-4-(trifluoromethyl)pyridine-2-carboxylate
Methyl 5-bromo-2-(difluoromethyl)-3-(trifluoromethyl)pyridine-4-carboxylate