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