4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-(acetyloxy)-3,3-dimethyl-7-oxo-, phenylmethyl ester, (2S,5R,6S)-;Benzyl (2S,5R,6S)-6-acetoxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate
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