4-(Bromomethyl)-2-(difluoromethyl)-5-methylpyridine-3-carboxylic acid
4-(Bromomethyl)-2-(difluoromethyl)-3-methylpyridine-6-carboxylic acid
4-(Bromomethyl)-2-(difluoromethyl)-3-methylpyridine-5-carboxylic acid
5-(Bromomethyl)-3-(difluoromethyl)-2-methylpyridine-4-carboxylic acid