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Vijayan, Kalyani and Anderson, BF and Hodgkin, DC (1973) Crystal and molecular structure of a synthetic compound related to the Penicillins and Cephalosporins, 3-BenzyS 7-t-Butyl 2,2-DimethyI-8-oxo-4-thia-1-aza-6aH-bicycfo[4.2.0]octane-3b,13; 7a-dicarboxylate. Journal of the Chemical Society. pp. 484-488.