4FD8:
reference: Crystal structure of a pre-acylation complex of the beta-lactamase inhibitor, sulbactam, bound to a sulfenamide bond containing thiol-beta-lactamase., Rodkey EA, Drawz SM, Sampson JM, Bethel CR, Bonomo RA, van den Akker F, J Am Chem Soc. 2012 Sep 13. PMID: 22974281

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