6DGU:
reference: Structural Insights into the Inhibition of the Extended-Spectrum beta-Lactamase PER-2 by Avibactam., Ruggiero M, Papp-Wallace KM, Brunetti F, Barnes MD, Bonomo RA, Gutkind G, Klinke S, Power P, Antimicrob Agents Chemother. 2019 Aug 23;63(9). pii: AAC.00487-19. doi:, 10.1128/AAC.00487-19. Print 2019 Sep. PMID: 31235626

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