3U4H:
reference: CD38 Structure-Based Inhibitor Design Using the 1-Cyclic Inosine 5'-Diphosphate Ribose Template., Moreau C, Liu Q, Graeff R, Wagner GK, Thomas MP, Swarbrick JM, Shuto S, Lee HC, Hao Q, Potter BV, PLoS One. 2013 Jun 19;8(6):e66247. Print 2013. PMID: 23840430

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