1SMW:
reference: The unique hydrogen bonded water in the reduced form of Clostridium pasteurianum rubredoxin and its possible role in electron transfer., Park IY, Youn B, Harley JL, Eidsness MK, Smith E, Ichiye T, Kang C, J Biol Inorg Chem 2004 Jun;9(4):423-8. Epub 2004 Apr 6. PMID: 15067525

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