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(5R)-6-[Acetyloxy(7,10-dioxa-2,3-diazatricyclo[6.4.0.02,6]dodeca-1(8),3,5-trien-4-yl)methyl]-6-bromo-3-[(4-nitrophenyl)methyl]-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate


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