2GMS:
reference: The structure of GDP-4-keto-6-deoxy-D-mannose-3-dehydratase: a unique coenzyme B6-dependent enzyme., Cook PD, Thoden JB, Holden HM, Protein Sci. 2006 Sep;15(9):2093-106. PMID: 16943443

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