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