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