2LSF:
reference: Structure and Stability of Duplex DNA Containing (5'S)-5',8-Cyclo-2'-deoxyadenosine: An Oxidative Lesion Repair by NER., Zaliznyak T, Lukin M, de Los Santos CR, Chem Res Toxicol. 2012 Aug 28. PMID: 22928555

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