2D1H:
reference: The putative DNA-binding protein Sto12a from the thermoacidophilic archaeon Sulfolobus tokodaii contains intrachain and interchain disulfide bonds., Shinkai A, Sekine S, Urushibata A, Terada T, Shirouzu M, Yokoyama S, J Mol Biol. 2007 Oct 5;372(5):1293-304. Epub 2007 Aug 2. PMID: 17720190

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