1PPG:
reference: The refined 2.3 A crystal structure of human leukocyte elastase in a complex with a valine chloromethyl ketone inhibitor., Wei AZ, Mayr I, Bode W, FEBS Lett 1988 Jul 18;234(2):367-73. PMID: 3391280

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