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