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