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