1D26:
reference: Effect of a single 3'-methylene phosphonate linkage on the conformation of an A-DNA octamer double helix., Heinemann U, Rudolph LN, Alings C, Morr M, Heikens W, Frank R, Blocker H, Nucleic Acids Res 1991 Feb 11;19(3):427-33. PMID: 2011517

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