2Y6T:
reference: Molecular Recognition of Chymotrypsin by the Serine Protease Inhibitor Ecotin from Yersinia pestis., Clark EA, Walker N, Ford DC, Cooper IA, Oyston PC, Acharya KR, J Biol Chem. 2011 Jul 8;286(27):24015-22. Epub 2011 Apr 29. PMID: 21531711

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