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