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