2HRI:
reference: Structural basis for binding of porphyrin to human telomeres., Parkinson GN, Ghosh R, Neidle S, Biochemistry. 2007 Mar 6;46(9):2390-7. Epub 2007 Feb 3. PMID: 17274602

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