(2S,5R)-2β-(Benzhydryloxycarbonyl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-4-oxide;(2S,5R)-2β-[(Benzhydryloxy)carbonyl]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane4-oxide
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