Ethyl 4-(difluoromethyl)-3-methoxy-2-nitropyridine-6-acetate
Methyl 4-(chloromethyl)-3-(difluoromethyl)-6-methoxypyridine-2-acetate
Methyl 4-(chloromethyl)-2-(difluoromethyl)-6-methoxypyridine-3-acetate
Methyl 4-(chloromethyl)-2-(difluoromethyl)-3-methoxypyridine-6-acetate