5DB6:
reference: N7 Methylation Alters Hydrogen-Bonding Patterns of Guanine in Duplex DNA., Kou Y, Koag MC, Lee S, J Am Chem Soc. 2015 Nov 11;137(44):14067-70. doi: 10.1021/jacs.5b10172. Epub 2015, Nov 2. PMID: 26517568

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