4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(acetyloxy)(2,3-dihydropyrazolo[5,1-b]oxazol-6-yl)methyl]-6-bromo-7-oxo-, (4-nitrophenyl)methyl ester, (5R)-
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