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