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