4Z9X:
reference: Structural determinants in bacterial 2-keto-3-deoxy-D-gluconate dehydrogenase KduD for dual-coenzyme specificity., Takase R, Maruyama Y, Oiki S, Mikami B, Murata K, Hashimoto W, Proteins. 2016 Jul;84(7):934-47. doi: 10.1002/prot.25042. Epub 2016 Apr 21. PMID: 27028675

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