2QCX:
reference: Mutagenesis studies on TenA: A thiamin salvage enzyme from Bacillus subtilis., Jenkins AL, Zhang Y, Ealick SE, Begley TP, Bioorg Chem. 2008 Feb;36(1):29-32. Epub 2007 Dec 3. PMID: 18054064

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