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