2KE8:
reference: Solution structure of a DNA double helix with consecutive metal-mediated base pairs., Johannsen S, Megger N, Bohme D, Sigel RK, Muller J, Nat Chem. 2010 Mar;2(3):229-34. Epub 2010 Jan 17. PMID: 21124482

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