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