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