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