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2,2-Dimethylpropanoyloxymethyl (5S)-3-[[tert-butyl(dimethyl)silyl]oxymethyl]-6-(4-methyl-2-oxo-1,3-dioxolan-4-yl)-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate


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