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