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