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