5DF7:
reference: Crystal structures of penicillin-binding protein 3 in complexes with azlocillin and cefoperazone in both acylated and deacylated forms., Ren J, Nettleship JE, Males A, Stuart DI, Owens RJ, FEBS Lett. 2016 Jan;590(2):288-97. doi: 10.1002/1873-3468.12054. Epub 2016 Jan, 23. PMID: 26823174

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