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