3OK2:
reference: How does hydroxyl introduction influence the double helical structure: the stabilization of an altritol nucleic acid:ribonucleic acid duplex., Ovaere M, Sponer J, Sponer JE, Herdewijn P, Van Meervelt L, Nucleic Acids Res. 2012 Aug;40(15):7573-83. Epub 2012 May 25. PMID: 22638588

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