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