3KKU:
reference: Complementarity between a docking and a high-throughput screen in discovering new cruzain inhibitors., Ferreira RS, Simeonov A, Jadhav A, Eidam O, Mott BT, Keiser MJ, McKerrow JH, Maloney DJ, Irwin JJ, Shoichet BK, J Med Chem. 2010 Jul 8;53(13):4891-905. PMID: 20540517

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