Methyl 4-amino-2-(bromomethyl)-3-(difluoromethyl)pyridine-5-acetate
Methyl 5-amino-2-(bromomethyl)-3-(difluoromethyl)pyridine-6-acetate
Methyl 5-amino-3-(bromomethyl)-4-(difluoromethyl)pyridine-2-acetate
2-Amino-6-(bromomethyl)-3-(difluoromethyl)pyridine-4-acetic acid