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