4-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-6-carboxaldehyde
Methyl 2-hydroxy-5-iodo-3-(trifluoromethoxy)pyridine-6-carboxylate
4-Hydroxy-2-nitro-6-(trifluoromethoxy)pyridine-3-carboxaldehyde
4-(Bromomethyl)-6-hydroxy-2-(trifluoromethoxy)pyridine-3-carboxaldehyde