Methyl 4-bromo-2-(difluoromethyl)-6-hydroxypyridine-3-carboxylate
Methyl 4-bromo-2-(difluoromethyl)-5-hydroxypyridine-3-carboxylate
Methyl 4-bromo-2-(difluoromethyl)-3-hydroxypyridine-5-carboxylate
Methyl 3-bromo-5-(difluoromethyl)-6-hydroxypyridine-2-carboxylate