2NVD:
reference: Evidence for a Novel Binding Site Conformer of Aldose Reductase in Ligand-Bound State., Steuber H, Zentgraf M, La Motta C, Sartini S, Heine A, Klebe G, J Mol Biol. 2007 Mar 15;. PMID: 17418233

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