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