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