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