3RKJ:
reference: Structure of apo- and monometalated forms of NDM-1--a highly potent carbapenem-hydrolyzing metallo-beta-lactamase., Kim Y, Tesar C, Mire J, Jedrzejczak R, Binkowski A, Babnigg G, Sacchettini J, Joachimiak A, PLoS One. 2011;6(9):e24621. Epub 2011 Sep 8. PMID: 21931780

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