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O-[(4-Nitrophenyl)methyl] (5R,6S)-6-[(1R)-1-hydroxyethyl]-7-oxo-3-[(2-oxo-1,3-dioxolan-4-yl)methyl]-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carbothioate


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