2MB3:
reference: Solution structure of an intramolecular (3+1) human telomeric G-quadruplex bound to a telomestatin derivative., Chung WJ, Heddi B, Tera M, Iida K, Nagasawa K, Phan AT, J Am Chem Soc. 2013 Aug 2. PMID: 23909929

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