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