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