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