4OM8:
reference: Crystal structure of 5-formyl-3-hydroxy-2-methylpyridine 4-carboxylic acid 5-dehydrogenase, an NAD(+)-dependent dismutase from Mesorhizobium loti., Mugo AN, Kobayashi J, Mikami B, Yoshikane Y, Yagi T, Ohnishi K, Biochem Biophys Res Commun. 2015 Jan 2;456(1):35-40. doi:, 10.1016/j.bbrc.2014.11.028. Epub 2014 Nov 18. PMID: 25446130

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