4-Hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-3-acetic acid
5-Fluoro-2-(fluoromethyl)-4-(trifluoromethoxy)-3-(trifluoromethyl)pyridine
4-Hydroxy-3-nitro-5-(trifluoromethoxy)pyridine-2-acetic acid
4-Hydroxy-6-nitro-2-(trifluoromethoxy)pyridine-3-acetic acid