3NYP:
reference: Fluorine in medicinal chemistry: beta-fluorination of peripheral pyrrolidines attached to acridine ligands affects their interactions with G-quadruplex DNA., Campbell NH, Smith DL, Reszka AP, Neidle S, O'Hagan D, Org Biomol Chem. 2011 Mar 7;9(5):1328-31. Epub 2011 Jan 10. PMID: 21221451

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