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