for the following products
3-Azetidinepropanoic acid,1-(4-fluorophenyl)-2-oxo-4-[4-(phenylmethoxy)phenyl]-,methyl ester,(3R,4S)- | Methyl (3R,4S)-1-(4-fluorophenyl)-2-oxo-4-[4-(phenylmethoxy)phenyl]-3-azetidinepropanoate and trans-Methyl-3-(((3-[2-oxo-4(benzyloxyphenyl)-1-(4-fluorophenyl)-azetidinone])propionate
