Methyl 3-hydroxy-6-nitro-2-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 5-hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-6-carboxylate
Methyl 4-hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-6-carboxylate
2-Hydroxy-5-nitro-3-(trifluoromethoxy)pyridine-6-acetic acid