| 1O0K: reference: Structure of the first parallel DNA quadruplex-drug complex., Clark GR, Pytel PD, Squire CJ, Neidle S, J Am Chem Soc 2003 Apr 9;125(14):4066-7. PMID: 12670225 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).