5G4C:
reference: SIRT2 Reverses 4-Oxononanoyl Lysine Modification on Histones., Jin J, He B, Zhang X, Lin H, Wang Y, J Am Chem Soc. 2016 Sep 28;138(38):12304-7. doi: 10.1021/jacs.6b04977. Epub 2016 , Sep 15. PMID: 27610633

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