4LGU:
reference: Design, stereoselective synthesis, and biological evaluation of novel tri-cyclic compounds as inhibitor of apoptosis proteins (IAP) antagonists., Asano M, Hashimoto K, Saito B, Shiokawa Z, Sumi H, Yabuki M, Yoshimatsu M, Aoyama K, Hamada T, Morishita N, Dougan DR, Mol CD, Yoshida S, Ishikawa T, Bioorg Med Chem. 2013 Sep 15;21(18):5725-37. doi: 10.1016/j.bmc.2013.07.020. Epub, 2013 Jul 18. PMID: 23928071

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