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