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