2H7Y:
reference: Structural and mechanistic insights into polyketide macrolactonization from polyketide-based affinity labels., Giraldes JW, Akey DL, Kittendorf JD, Sherman DH, Smith JL, Fecik RA, Nat Chem Biol. 2006 Oct;2(10):531-6. Epub 2006 Sep 10. PMID: 16969373

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