6-Amino-3-(chloromethyl)-2-(difluoromethyl)pyridine-4-carboxylic acid
2-Amino-5-(bromomethyl)-4-(difluoromethyl)pyridine-3-carboxylic acid
2-Amino-5-(chloromethyl)-3-(difluoromethyl)pyridine-6-carboxylic acid
2-Amino-4-(bromomethyl)-5-(difluoromethyl)pyridine-3-carboxylic acid