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