Ethyl 3-hydroxy-4-nitro-5-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 3-hydroxy-2-nitro-6-(trifluoromethoxy)pyridine-5-carboxylate
Ethyl 3-hydroxy-2-nitro-5-(trifluoromethoxy)pyridine-4-carboxylate
3-Hydroxy-4-methoxy-2-(trifluoromethoxy)pyridine-6-carboxaldehyde