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