Ethyl 5-(chloromethyl)-4-(difluoromethyl)-3-hydroxypyridine-2-carboxylate
Methyl 2-(bromomethyl)-3-(difluoromethyl)-4-hydroxypyridine-5-acetate
Ethyl 3-(chloromethyl)-4-(difluoromethyl)-2-hydroxypyridine-5-carboxylate
Ethyl 4-(bromomethyl)-2-(difluoromethyl)-5-hydroxypyridine-3-acetate