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