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