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(4S,5beta)-4alpha-Methyl-6beta-[(4S)-4alpha-methyl-2-oxo-1,3-dioxolan-4-yl]-3-[(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid sodium salt


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