1MTS:
reference: Crystal structures of factor Xa specific inhibitors in complex with trypsin: structural grounds for inhibition of factor Xa and selectivity against thrombin., Stubbs MT, Huber R, Bode W, FEBS Lett 1995 Nov 13;375(1-2):103-7. PMID: 7498454

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