3-Fluoro-2-nitro-6-(trifluoromethoxy)pyridine-5-carboxylic acid
3-Fluoro-2-nitro-5-(trifluoromethoxy)pyridine-4-carboxylic acid
6-Fluoro-3-iodo-4-(trifluoromethoxy)pyridine-2-carboxylic acid
6-Fluoro-2-nitro-3-(trifluoromethoxy)pyridine-4-carboxylic acid