1HBT:
reference: Crystal structure of a peptidyl pyridinium methyl ketone inhibitor with thrombin., Rehse PH, Steinmetzer T, Li Y, Konishi Y, Cygler M, Biochemistry 1995 Sep 12;34(36):11537-44. PMID: 7547884

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