1OKX:
reference: Binding structure of elastase inhibitor scyptolin A., Matern U, Schleberger C, Jelakovic S, Weckesser J, Schulz GE, Chem Biol 2003 Oct;10(10):997-1001. PMID: 14583266

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