Ethyl 3-hydroxy-2-nitro-6-(trifluoromethoxy)pyridine-5-acetate
Ethyl 3-hydroxy-2-nitro-5-(trifluoromethoxy)pyridine-4-acetate
6-Fluoro-3-(fluoromethyl)-4-(trifluoromethoxy)pyridine-2-acetic acid
Ethyl 6-hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-4-acetate