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(2R,3R,4S)-3-Acetamido-2-[(S)-3-[[4-[3-[[(S)-[(2R,3R,4S)-3-acetamido-4-(carbamoylamino)-6-carboxy-3,4-dihydro-2H-pyran-2-yl]-[(4R)-2-oxo-1,3-dioxolan-4-yl]methoxy]carbonylamino]propylamino]-4-oxobutanoyl]amino]propylcarbamoyloxy-[(4R)-2-oxo-1,3-dioxolan-4


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