Methyl 3-amino-2-(bromomethyl)-6-(difluoromethyl)pyridine-4-carboxylate
Methyl 3-amino-2-(bromomethyl)-4-(difluoromethyl)pyridine-6-carboxylate
Methyl 2-amino-6-(bromomethyl)-5-(difluoromethyl)pyridine-3-carboxylate
Methyl 2-amino-6-(bromomethyl)-3-(difluoromethyl)pyridine-5-carboxylate