Chemical Formula: C27H27ClFN5O7S2,Exact Mass: 651.10245,Molecular Weight: 652.10940,(2S,6R)-6-((2S,5R,6R)-6-(3-(2-chloro-6-fluorophenyl)-5-methylisoxazole-4-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid