5-Hydroxy-4-methyl-3-(trifluoromethoxy)pyridine-2-carboxaldehyde
6-Fluoro-3-methoxy-4-(trifluoromethoxy)pyridine-2-carboxaldehyde
3-Hydroxy-4-methyl-2-(trifluoromethoxy)pyridine-5-carboxaldehyde
2-Fluoro-5-methoxy-3-(trifluoromethoxy)pyridine-4-carboxaldehyde