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