1X6W:
reference: How much pi-stacking do DNA termini seek? Solution structure of a self-complementary DNA hexamer with trimethoxystilbenes capping the terminal base pairs., Tuma J, Paulini R, Rojas Stutz JA, Richert C, Biochemistry. 2004 Dec 21;43(50):15680-7. PMID: 15595824

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