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