5VI6:
reference: Binding of the Microbial Cyclic Tetrapeptide Trapoxin A to the Class I Histone Deacetylase HDAC8., Porter NJ, Christianson DW, ACS Chem Biol. 2017 Aug 30. doi: 10.1021/acschembio.7b00330. PMID: 28846375

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