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