1YQD:
reference: Structural and Kinetic Basis for Substrate Selectivity in Populus tremuloides Sinapyl Alcohol Dehydrogenase., Bomati EK, Noel JP, Plant Cell 2005 May;17(5):1598-611. Epub 2005 Apr 13. PMID: 15829607

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