5-(Chloromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine-4-carboxaldehyde
4-(Chloromethyl)-5-hydroxy-3-(trifluoromethoxy)pyridine-2-carboxaldehyde
3-(Fluoromethyl)-5-hydroxy-4-(trifluoromethoxy)pyridine-2-acetic acid
4-(Chloromethyl)-3-hydroxy-2-(trifluoromethoxy)pyridine-5-carboxaldehyde