2A5R:
reference: Small-molecule interaction with a five-guanine-tract G-quadruplex structure from the human MYC promoter., Phan AT, Kuryavyi V, Gaw HY, Patel DJ, Nat Chem Biol. 2005 Aug;1(3):167-73. Epub 2005 Jul 17. PMID: 16408022

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