4KYS:
reference: Structure of a Clostridium botulinum C143S thiaminase I/thiamin complex reveals active site architecture., Sikowitz MD, Shome B, Begley TP, Ealick SE, Biochemistry. 2013 Sep 30. PMID: 24079939

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