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