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