4PGH:
reference: Determination of the structure and catalytic mechanism of Sorghum bicolor caffeic acid O-methyltransferase and the structural impact of three brown midrib12 mutations., Green AR, Lewis KM, Barr JT, Jones JP, Lu F, Ralph J, Vermerris W, Sattler SE, Kang C, Plant Physiol. 2014 Jun 19. pii: pp.114.241729. PMID: 24948836

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