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