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