4EYL:
reference: New Delhi Metallo-beta-Lactamase: Structural Insights into beta-Lactam Recognition and Inhibition., King DT, Worrall LJ, Gruninger R, Strynadka NC, J Am Chem Soc. 2012 Jul 18;134(28):11362-5. Epub 2012 Jul 5. PMID: 22713171

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