6CEF:
reference: Identification and Structure-Activity Relationship of HDAC6 Zinc-Finger Ubiquitin Binding Domain Inhibitors., Ferreira de Freitas R, Harding RJ, Franzoni I, Ravichandran M, Mann MK, Ouyang H, Lautens M, Santhakumar V, Arrowsmith CH, Schapira M, J Med Chem. 2018 May 9. doi: 10.1021/acs.jmedchem.8b00258. PMID: 29741882

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