1D5I:
reference: Conformational effects in biological catalysis: an antibody-catalyzed oxy-cope rearrangement., Mundorff EC, Hanson MA, Varvak A, Ulrich H, Schultz PG, Stevens RC, Biochemistry 2000 Feb 1;39(4):627-32. PMID: 10651626

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