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