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