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