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