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