3GTA:
reference: Antagonists of inhibitor of apoptosis proteins based on thiazole amide isosteres., Cohen F, Koehler MF, Bergeron P, Elliott LO, Flygare JA, Franklin MC, Gazzard L, Keteltas SF, Lau K, Ly CQ, Tsui V, Fairbrother WJ, Bioorg Med Chem Lett. 2010 Feb 8. PMID: 20189383

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