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