(5S,6R)-6-{2S-2-(3-phenylpropionoyl)amino-2-(3-fluorophenyl)methyl-acetamido}-4-thia-1-azabicyclo [3,2,0] heptan-7-one 以81%的产率得到(5S,6R)-6-{2S-2-(3-phenylpropionoyl)amino-2-(3-fluorophenyl)methyl-acetamido}-4,4-dioxo-4-thia-1-azabicyclo [3,2,0] heptan-7-one