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(2R,3R,4S)-3-Acetamido-2-[(S)-2-[4-[2-[[(S)-[(2R,3R,4S)-3-acetamido-6-carboxy-4-(diaminomethylideneamino)-3,4-dihydro-2H-pyran-2-yl]-[(4R)-2-oxo-1,3-dioxolan-4-yl]methoxy]carbonylamino]ethyl]phenyl]ethylcarbamoyloxy-[(4R)-2-oxo-1,3-dioxolan-4-yl]methyl]-4


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