5GCH:
reference: Photolysis and deacylation of inhibited chymotrypsin., Stoddard BL, Bruhnke J, Koenigs P, Porter N, Ringe D, Petsko GA, Biochemistry 1990 Sep 4;29(35):8042-51. PMID: 2261462

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