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