4-Cyano-3-hydroxy-6-(trifluoromethoxy)pyridine-2-carboxaldehyde
6-Cyano-2-(fluoromethyl)-4-hydroxy-3-(trifluoromethoxy)pyridine
2-Cyano-6-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxaldehyde
2-Cyano-6-hydroxy-3-(trifluoromethoxy)pyridine-5-carboxaldehyde