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