Methyl 3-chloro-2-cyano-4-(trifluoromethoxy)pyridine-6-acetate
Methyl 4-chloro-5-cyano-3-(trifluoromethoxy)pyridine-2-acetate
Methyl 4-chloro-3-cyano-2-(trifluoromethoxy)pyridine-6-acetate
Methyl 6-chloro-2-cyano-3-(trifluoromethoxy)pyridine-4-acetate