Methyl 5-(difluoromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine-6-acetate
Methyl 3-(difluoromethyl)-2-hydroxy-6-(trifluoromethoxy)pyridine-4-acetate
Methyl 3-(difluoromethyl)-2-hydroxy-4-(trifluoromethoxy)pyridine-6-acetate
Methyl 2-(difluoromethyl)-6-hydroxy-5-(trifluoromethoxy)pyridine-3-acetate