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