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