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Bis{(2S,5R,6R)-6-[[3-(2-Chlorophenyl)-5-methyl-1,2-oxazole-4-carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid}-N,N’-dibenzyl ethane-1,2-diamine salt