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