1PW8:
reference: Crystal structures of complexes between the R61 DD-peptidase and peptidoglycan-mimetic beta-lactams: a non-covalent complex with a "perfect penicillin"., Silvaggi NR, Josephine HR, Kuzin AP, Nagarajan R, Pratt RF, Kelly JA, J Mol Biol 2005 Jan 21;345(3):521-33. PMID: 15581896

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