1YK7:
reference: Novel and potent cyclic cyanamide-based cathepsin K inhibitors., Deaton DN, Hassell AM, McFadyen RB, Miller AB, Miller LR, Shewchuk LM, Tavares FX, Willard DH Jr, Wright LL, Bioorg Med Chem Lett. 2005 Apr 1;15(7):1815-9. PMID: 15780613

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