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