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