Methyl 4-cyano-3-hydroxy-5-(trifluoromethoxy)pyridine-2-carboxylate
Methyl 4-cyano-6-hydroxy-2-(trifluoromethoxy)pyridine-3-carboxylate
4-Chloro-3-hydroxy-6-(trifluoromethoxy)pyridine-2-carboxylic acid
4-Chloro-3-hydroxy-2-(trifluoromethoxy)pyridine-6-carboxylic acid