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