Ethyl 3-(difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-6-carboxylate
Ethyl 3-(difluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine-2-carboxylate
Methyl 6-(bromomethyl)-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 5-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-3-carboxylate