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