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