1W3V:
reference: Unexpected oxidation of a depsipeptide substrate analogue in crystalline isopenicillin N synthase., Daruzzaman A, Clifton IJ, Adlington RM, Baldwin JE, Rutledge PJ, Chembiochem. 2006 Feb;7(2):351-8. PMID: 16444759

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