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