3KUY:
reference: DNA stretching in the nucleosome facilitates alkylation by an intercalating antitumour agent., Davey GE, Wu B, Dong Y, Surana U, Davey CA, Nucleic Acids Res. 2009 Dec 21. PMID: 20026584

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