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(2R,3R,4S)-3-Acetamido-4-[bis[(2-methylpropan-2-yl)oxycarbonylamino]methylideneamino]-2-methyl-2-[(4-nitrophenoxy)carbonyloxy-[(4R)-2-oxo-1,3-dioxolan-4-yl]methyl]-3,4-dihydropyran-6-carboxylic acid


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