3CE5:
reference: Structural basis of DNA quadruplex recognition by an acridine drug., Campbell NH, Parkinson GN, Reszka AP, Neidle S, J Am Chem Soc. 2008 May 28;130(21):6722-4. Epub 2008 May 6. PMID: 18457389

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