2VEO:
reference: X-ray structure of Candida antarctica lipase A shows a novel lid structure and a likely mode of interfacial activation., Ericsson DJ, Kasrayan A, Johansson P, Bergfors T, Sandstrom AG, Backvall JE, Mowbray SL, J Mol Biol. 2008 Feb 8;376(1):109-19. Epub 2007 Nov 6. PMID: 18155238

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