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