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