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