5-Hydroxy-2-nitro-4-(trifluoromethoxy)pyridine-3-carboxylic acid
2-(Chloromethyl)-4-fluoro-6-(trifluoromethoxy)pyridine-3-carboxylic acid
2-(Chloromethyl)-4-fluoro-3-(trifluoromethoxy)pyridine-6-carboxylic acid
2-(Chloromethyl)-3-fluoro-6-(trifluoromethoxy)pyridine-4-carboxylic acid