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Methyl (2R,3R,4S)-3-acetamido-4-[bis[(2-methylpropan-2-yl)oxycarbonylamino]methylideneamino]-2-[(R)-hydroxy-[(4R)-2-oxo-1,3-dioxolan-4-yl]methyl]-2-methyl-3,4-dihydropyran-6-carboxylate


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