5VKT:
reference: The Enzyme Activity and Substrate Specificity of Two Major Cinnamyl Alcohol Dehydrogenases in Sorghum (Sorghum bicolor), SbCAD2 and SbCAD4., Jun SY, Walker AM, Kim H, Ralph J, Vermerris W, Sattler SE, Kang C, Plant Physiol. 2017 Aug;174(4):2128-2145. doi: 10.1104/pp.17.00576. Epub 2017 Jun, 12. PMID: 28606901

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