4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2R)-aminophenylacetyl]amino]-3,3-dimethyl-7-oxo-,[4-(4-oxo-4H-1-benzopyran-2-yl)phenyl]methyl ester, (2S,5R,6R)-
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