Methyl 3-chloro-6-(difluoromethyl)-2-hydroxypyridine-5-carboxylate
Methyl 3-chloro-4-(difluoromethyl)-2-hydroxypyridine-6-carboxylate
Methyl 3-chloro-2-(difluoromethyl)-6-hydroxypyridine-4-carboxylate
Ethyl 2-chloro-4-(difluoromethyl)-3-hydroxypyridine-6-acetate