1HKL:
reference: Crystal structures of the free and liganded form of an esterolytic catalytic antibody., Wedemayer GJ, Wang LH, Patten PA, Schultz PG, Stevens RC, J Mol Biol 1997 May 2;268(2):390-400. PMID: 9159478

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