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