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