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