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