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