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