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