2LSX:
reference: A minimal i-motif stabilized by minor groove G:T:G:T tetrads., Escaja N, Viladoms J, Garavis M, Villasante A, Pedroso E, Gonzalez C, Nucleic Acids Res. 2012 Oct 5. PMID: 23042679

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