Methyl 4-(bromomethyl)-2-(difluoromethyl)-5-methoxypyridine-3-acetate
Methyl 4-(bromomethyl)-2-(difluoromethyl)-3-methoxypyridine-5-acetate
Methyl 3-(bromomethyl)-5-(difluoromethyl)-4-methoxypyridine-2-acetate
Methyl 3-(bromomethyl)-5-(difluoromethyl)-2-methoxypyridine-4-acetate