3RXX:
reference: Crystal Structures of KPC-2 beta-Lactamase in Complex with 3-NPBA and PSR-3-226., Ke W, Bethel CR, Papp-Wallace KM, Pagadala SR, Nottingham M, Fernandez D, Buynak JD, Bonomo RA, van den Akker F, Antimicrob Agents Chemother. 2012 Feb 13. PMID: 22330909

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