2N60:
reference: G-quadruplexes with (4n - 1) guanines in the G-tetrad core: formation of a G-triad.water complex and implication for small-molecule binding., Heddi B, Martin-Pintado N, Serimbetov Z, Kari TM, Phan AT, Nucleic Acids Res. 2016 Jan 29;44(2):910-6. doi: 10.1093/nar/gkv1357. Epub 2015, Dec 15. PMID: 26673723

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