Ethyl 4-(bromomethyl)-2-(difluoromethyl)-3-hydroxypyridine-5-carboxylate
Ethyl 5-(bromomethyl)-4-(difluoromethyl)-3-hydroxypyridine-2-carboxylate
Ethyl 6-(bromomethyl)-4-(difluoromethyl)-3-hydroxypyridine-2-carboxylate
Ethyl 2-(bromomethyl)-3-(difluoromethyl)-4-hydroxypyridine-5-carboxylate