5DDK:
reference: Functional Dissection of the Bipartite Active Site of the Class I Coenzyme A (CoA)-Transferase Succinyl-CoA:Acetate CoA-Transferase., Murphy JR, Mullins EA, Kappock TJ, Front Chem. 2016 May 23;4:23. doi: 10.3389/fchem.2016.00023. eCollection 2016. PMID: 27242998

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