6CGP:
reference: Multicomponent Synthesis and Binding Mode of Imidazo[1,2- a]pyridine-Capped Selective HDAC6 Inhibitors., Mackwitz MKW, Hamacher A, Osko JD, Held J, Scholer A, Christianson DW, Kassack MU, Hansen FK, Org Lett. 2018 Jun 1;20(11):3255-3258. doi: 10.1021/acs.orglett.8b01118. Epub, 2018 May 23. PMID: 29790770

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