Ethyl 4-hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-5-acetate
Ethyl 4-hydroxy-6-nitro-3-(trifluoromethoxy)pyridine-2-acetate
Ethyl 3-hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-4-acetate
Ethyl 2-fluoro-4-(fluoromethyl)-3-(trifluoromethoxy)pyridine-5-carboxylate