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