3SPU:
reference: Crystal structure of New Delhi metallo-beta-lactamase reveals molecular basis for antibiotic resistance., King D, Strynadka N, Protein Sci. 2011 Sep;20(9):1484-91. doi: 10.1002/pro.697. Epub 2011 Aug, 2. PMID: 21774017

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