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2-[(E)-[2-[[2-[(5-Methyl-2-oxo-1,3-dioxolan-4-yl)methoxycarbonyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl]amino]-2-oxo-1-(1,3-thiazol-4-yl)ethylidene]amino]oxyacetic acid


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