Methyl 2-cyano-6-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxylate
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