2VDG:
reference: Barley aldose reductase: structure, cofactor binding, and substrate recognition in the aldo/keto reductase 4C family., Olsen JG, Pedersen L, Christensen CL, Olsen O, Henriksen A, Proteins. 2008 May 15;71(3):1572-81. PMID: 18300247

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