3CFJ:
reference: Conformational isomerism can limit antibody catalysis., Debler EW, Muller R, Hilvert D, Wilson IA, J Biol Chem. 2008 Jun 13;283(24):16554-60. Epub 2008 Apr 16. PMID: 18417480

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