5-Hydroxy-2-nitro-4-(trifluoromethoxy)pyridine-3-carboxaldehyde
6-(Chloromethyl)-2-hydroxy-3-nitro-4-(trifluoromethoxy)pyridine
4-Hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-3-carboxaldehyde
5-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-4-carboxaldehyde