4HA6:
reference: Crystal structure of pyridoxine 4-oxidase from Mesorhizobium loti., Mugo AN, Kobayashi J, Yamasaki T, Mikami B, Ohnishi K, Yoshikane Y, Yagi T, Biochim Biophys Acta. 2013 Jun;1834(6):953-63. doi: 10.1016/j.bbapap.2013.03.004., Epub 2013 Mar 15. PMID: 23501672

This OCA Structure page
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