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