3IF6:
reference: Crystal structure of the narrow-spectrum OXA-46 class D beta-lactamase: relationship between active-site lysine carbamylation and inhibition by polycarboxylates., Docquier JD, Benvenuti M, Calderone V, Giuliani F, Kapetis D, De Luca F, Rossolini GM, Mangani S, Antimicrob Agents Chemother. 2010 May;54(5):2167-74. Epub 2010 Feb 9. PMID: 20145076

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).