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