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