1CSB:
reference: Crystal structure of cathepsin B inhibited with CA030 at 2.0-A resolution: A basis for the design of specific epoxysuccinyl inhibitors., Turk D, Podobnik M, Popovic T, Katunuma N, Bode W, Huber R, Turk V, Biochemistry 1995 Apr 11;34(14):4791-7. PMID: 7718586

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